1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
|
create table t1 (grp int, a bigint unsigned, c char(10) not null, d char(10) not null);
insert into t1 values (1,1,"a","a");
insert into t1 values (2,2,"b","a");
insert into t1 values (2,3,"c","b");
insert into t1 values (3,4,"E","a");
insert into t1 values (3,5,"C","b");
insert into t1 values (3,6,"D","b");
insert into t1 values (3,7,"d","d");
insert into t1 values (3,8,"d","d");
insert into t1 values (3,9,"D","c");
select grp,group_concat(c) from t1 group by grp;
grp group_concat(c)
1 a
2 b,c
3 E,C,D,d,d,D
explain extended select grp,group_concat(c) from t1 group by grp;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 9 100.00 Using filesort
Warnings:
Note 1003 select `test`.`t1`.`grp` AS `grp`,group_concat(`test`.`t1`.`c` separator ',') AS `group_concat(c)` from `test`.`t1` group by `test`.`t1`.`grp`
select grp,group_concat(a,c) from t1 group by grp;
grp group_concat(a,c)
1 1a
2 2b,3c
3 4E,5C,6D,7d,8d,9D
select grp,group_concat("(",a,":",c,")") from t1 group by grp;
grp group_concat("(",a,":",c,")")
1 (1:a)
2 (2:b),(3:c)
3 (4:E),(5:C),(6:D),(7:d),(8:d),(9:D)
select grp,group_concat(c separator ",") from t1 group by grp;
grp group_concat(c separator ",")
1 a
2 b,c
3 E,C,D,d,d,D
select grp,group_concat(c separator "---->") from t1 group by grp;
grp group_concat(c separator "---->")
1 a
2 b---->c
3 E---->C---->D---->d---->d---->D
select grp,group_concat(c order by c) from t1 group by grp;
grp group_concat(c order by c)
1 a
2 b,c
3 C,D,d,d,D,E
select grp,group_concat(c order by c desc) from t1 group by grp;
grp group_concat(c order by c desc)
1 a
2 c,b
3 E,D,d,d,D,C
select grp,group_concat(d order by a) from t1 group by grp;
grp group_concat(d order by a)
1 a
2 a,b
3 a,b,b,d,d,c
select grp,group_concat(d order by a desc) from t1 group by grp;
grp group_concat(d order by a desc)
1 a
2 b,a
3 c,d,d,b,b,a
select grp,group_concat(a order by a,d+c-ascii(c)-a) from t1 group by grp;
grp group_concat(a order by a,d+c-ascii(c)-a)
1 1
2 2,3
3 4,5,6,7,8,9
select grp,group_concat(a order by d+c-ascii(c),a) from t1 group by grp;
grp group_concat(a order by d+c-ascii(c),a)
1 1
2 3,2
3 7,8,4,6,9,5
select grp,group_concat(c order by 1) from t1 group by grp;
grp group_concat(c order by 1)
1 a
2 b,c
3 C,D,d,d,D,E
select grp,group_concat(distinct c order by c) from t1 group by grp;
grp group_concat(distinct c order by c)
1 a
2 b,c
3 C,D,E
select grp,group_concat(distinct c order by c desc) from t1 group by grp;
grp group_concat(distinct c order by c desc)
1 a
2 c,b
3 E,D,C
explain extended select grp,group_concat(distinct c order by c desc) from t1 group by grp;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 9 100.00 Using filesort
Warnings:
Note 1003 select `test`.`t1`.`grp` AS `grp`,group_concat(distinct `test`.`t1`.`c` order by `test`.`t1`.`c` DESC separator ',') AS `group_concat(distinct c order by c desc)` from `test`.`t1` group by `test`.`t1`.`grp`
select grp,group_concat(c order by c separator ",") from t1 group by grp;
grp group_concat(c order by c separator ",")
1 a
2 b,c
3 C,D,d,d,D,E
select grp,group_concat(c order by c desc separator ",") from t1 group by grp;
grp group_concat(c order by c desc separator ",")
1 a
2 c,b
3 E,D,d,d,D,C
select grp,group_concat(distinct c order by c separator ",") from t1 group by grp;
grp group_concat(distinct c order by c separator ",")
1 a
2 b,c
3 C,D,E
explain extended select grp,group_concat(distinct c order by c separator ",") from t1 group by grp;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 9 100.00 Using filesort
Warnings:
Note 1003 select `test`.`t1`.`grp` AS `grp`,group_concat(distinct `test`.`t1`.`c` order by `test`.`t1`.`c` ASC separator ',') AS `group_concat(distinct c order by c separator ",")` from `test`.`t1` group by `test`.`t1`.`grp`
select grp,group_concat(distinct c order by c desc separator ",") from t1 group by grp;
grp group_concat(distinct c order by c desc separator ",")
1 a
2 c,b
3 E,D,C
select grp,group_concat(c order by grp desc) from t1 group by grp order by grp;
grp group_concat(c order by grp desc)
1 a
2 c,b
3 D,d,d,D,C,E
select grp, group_concat(a separator "")+0 from t1 group by grp;
grp group_concat(a separator "")+0
1 1
2 23
3 456789
select grp, group_concat(a separator "")+0.0 from t1 group by grp;
grp group_concat(a separator "")+0.0
1 1.0
2 23.0
3 456789.0
select grp, ROUND(group_concat(a separator "")) from t1 group by grp;
grp ROUND(group_concat(a separator ""))
1 1
2 23
3 456789
drop table t1;
create table t1 (grp int, c char(10));
insert into t1 values (1,NULL),(2,"b"),(2,NULL),(3,"E"),(3,NULL),(3,"D"),(3,NULL),(3,NULL),(3,"D"),(4,""),(5,NULL);
select grp,group_concat(c order by c) from t1 group by grp;
grp group_concat(c order by c)
1 NULL
2 b
3 D,D,E
4
5 NULL
set group_concat_max_len = 4;
select grp,group_concat(c) from t1 group by grp;
grp group_concat(c)
1 NULL
2 b
3 D,D,
4
5 NULL
Warnings:
Warning 1260 Row 4 was cut by GROUP_CONCAT()
show warnings;
Level Code Message
Warning 1260 Row 4 was cut by GROUP_CONCAT()
set group_concat_max_len = 1024;
select group_concat(sum(c)) from t1 group by grp;
ERROR HY000: Invalid use of group function
select grp,group_concat(c order by 2) from t1 group by grp;
ERROR 42S22: Unknown column '2' in 'order clause'
drop table t1;
create table t1 ( URL_ID int(11), URL varchar(80));
create table t2 ( REQ_ID int(11), URL_ID int(11));
insert into t1 values (4,'www.host.com'), (5,'www.google.com'),(5,'www.help.com');
insert into t2 values (1,4), (5,4), (5,5);
select REQ_ID, Group_Concat(URL) as URL from t1, t2 where
t2.URL_ID = t1.URL_ID group by REQ_ID;
REQ_ID URL
1 X
5 X,X,X
select REQ_ID, Group_Concat(URL) as URL, Min(t1.URL_ID) urll,
Max(t1.URL_ID) urlg from t1, t2 where t2.URL_ID = t1.URL_ID group by REQ_ID;
REQ_ID URL urll urlg
1 X 4 4
5 X,X,X 4 5
drop table t1;
drop table t2;
create table t1 (id int, name varchar(16));
insert into t1 values (1,'longername'),(1,'evenlongername');
select ifnull(group_concat(concat(t1.id, ':', t1.name)), 'shortname') as 'without distinct: how it should be' from t1;
without distinct: how it should be
1:longername,1:evenlongername
select distinct ifnull(group_concat(concat(t1.id, ':', t1.name)), 'shortname') as 'with distinct: cutoff at length of shortname' from t1;
with distinct: cutoff at length of shortname
1:longername,1:evenlongername
drop table t1;
create table t1(id int);
create table t2(id int);
insert into t1 values(0),(1);
select group_concat(t1.id) FROM t1,t2;
group_concat(t1.id)
NULL
drop table t1;
drop table t2;
create table t1 (bar varchar(32));
insert into t1 values('test1'),('test2');
select group_concat(bar order by concat(bar,bar)) from t1;
group_concat(bar order by concat(bar,bar))
test1,test2
select group_concat(bar order by concat(bar,bar) desc) from t1;
group_concat(bar order by concat(bar,bar) desc)
test2,test1
select bar from t1 having group_concat(bar)='';
bar
select bar from t1 having instr(group_concat(bar), "test") > 0;
bar
test1
select bar from t1 having instr(group_concat(bar order by concat(bar,bar) desc), "test2,test1") > 0;
bar
test1
drop table t1;
create table t1 (a int, a1 varchar(10));
create table t2 (a0 int);
insert into t1 values (0,"a"),(0,"b"),(1,"c");
insert into t2 values (1),(2),(3);
select group_concat(a1 order by (t1.a IN (select a0 from t2))) from t1;
group_concat(a1 order by (t1.a IN (select a0 from t2)))
b,a,c
select group_concat(a1 order by (t1.a)) from t1;
group_concat(a1 order by (t1.a))
b,a,c
drop table t1, t2;
CREATE TABLE t1 (id1 tinyint(4) NOT NULL, id2 tinyint(4) NOT NULL);
INSERT INTO t1 VALUES (1, 1),(1, 2),(1, 3),(1, 4),(1, 5),(2, 1),(2, 2),(2, 3);
CREATE TABLE t2 (id1 tinyint(4) NOT NULL);
INSERT INTO t2 VALUES (1),(2),(3),(4),(5);
SELECT t1.id1, GROUP_CONCAT(t1.id2 ORDER BY t1.id2 ASC) AS concat_id FROM t1, t2 WHERE t1.id1 = t2.id1 AND t1.id1=1 GROUP BY t1.id1;
id1 concat_id
1 1,2,3,4,5
SELECT t1.id1, GROUP_CONCAT(t1.id2 ORDER BY t1.id2 ASC) AS concat_id FROM t1, t2 WHERE t1.id1 = t2.id1 GROUP BY t1.id1;
id1 concat_id
1 1,2,3,4,5
2 1,2,3
SELECT t1.id1, GROUP_CONCAT(t1.id2 ORDER BY t1.id2 DESC) AS concat_id FROM t1, t2 WHERE t1.id1 = t2.id1 GROUP BY t1.id1;
id1 concat_id
1 5,4,3,2,1
2 3,2,1
SELECT t1.id1, GROUP_CONCAT(t1.id2 ORDER BY 6-t1.id2 ASC) AS concat_id FROM t1, t2 WHERE t1.id1 = t2.id1 GROUP BY t1.id1;
id1 concat_id
1 5,4,3,2,1
2 3,2,1
SELECT t1.id1, GROUP_CONCAT(t1.id2,6-t1.id2 ORDER BY 6-t1.id2 ASC) AS concat_id FROM t1, t2 WHERE t1.id1 = t2.id1 GROUP BY t1.id1;
id1 concat_id
1 51,42,33,24,15
2 33,24,15
SELECT t1.id1, GROUP_CONCAT(t1.id2,6-t1.id2 ORDER BY 6-t1.id2 ASC) AS concat_id FROM t1, t2 WHERE t1.id1 = t2.id1 GROUP BY t1.id1;
id1 concat_id
1 51,42,33,24,15
2 33,24,15
SELECT t1.id1, GROUP_CONCAT(t1.id2,"/",6-t1.id2 ORDER BY 1+0,6-t1.id2,t1.id2 ASC) AS concat_id FROM t1, t2 WHERE t1.id1 = t2.id1 GROUP BY t1.id1;
id1 concat_id
1 5/1,4/2,3/3,2/4,1/5
2 3/3,2/4,1/5
drop table t1,t2;
create table t1 (s1 char(10), s2 int not null);
insert into t1 values ('a',2),('b',2),('c',1),('a',3),('b',4),('c',4);
select distinct s1 from t1 order by s2,s1;
s1
c
a
b
select group_concat(distinct s1) from t1;
group_concat(distinct s1)
a,b,c
select group_concat(distinct s1 order by s2) from t1 where s2 < 4;
group_concat(distinct s1 order by s2)
c,b,a
select group_concat(distinct s1 order by s2) from t1;
group_concat(distinct s1 order by s2)
c,b,a
drop table t1;
create table t1 (a int, c int);
insert into t1 values (1, 2), (2, 3), (2, 4), (3, 5);
create table t2 (a int, c int);
insert into t2 values (1, 5), (2, 4), (3, 3), (3,3);
select group_concat(c) from t1;
group_concat(c)
2,3,4,5
select group_concat(c order by (select c from t2 where t2.a=t1.a limit 1)) as grp from t1;
grp
5,4,3,2
select group_concat(c order by (select mid(group_concat(c order by a),1,5) from t2 where t2.a=t1.a)) as grp from t1;
grp
5,4,3,2
select group_concat(c order by (select mid(group_concat(c order by a),1,5) from t2 where t2.a=t1.a) desc) as grp from t1;
grp
2,4,3,5
select t1.a, group_concat(c order by (select c from t2 where t2.a=t1.a limit 1)) as grp from t1 group by 1;
a grp
1 2
2 4,3
3 5
select t1.a, group_concat(c order by (select mid(group_concat(c order by a),1,5) from t2 where t2.a=t1.a)) as grp from t1 group by 1;
a grp
1 2
2 4,3
3 5
select t1.a, group_concat(c order by (select mid(group_concat(c order by a),1,5) from t2 where t2.a=t1.a) desc) as grp from t1 group by 1;
a grp
1 2
2 4,3
3 5
select group_concat(c order by (select concat(5-t1.c,group_concat(c order by a)) from t2 where t2.a=t1.a)) as grp from t1;
grp
5,4,3,2
select group_concat(c order by (select concat(t1.c,group_concat(c)) from t2 where a=t1.a)) as grp from t1;
grp
2,3,4,5
select a,c,(select group_concat(c order by a) from t2 where a=t1.a) as grp from t1 order by grp;
a c grp
3 5 3,3
2 3 4
2 4 4
1 2 5
drop table t1,t2;
CREATE TABLE t1 ( a int );
CREATE TABLE t2 ( a int );
INSERT INTO t1 VALUES (1), (2);
INSERT INTO t2 VALUES (1), (2);
SELECT GROUP_CONCAT(t1.a*t2.a ORDER BY t2.a) FROM t1, t2 GROUP BY t1.a;
GROUP_CONCAT(t1.a*t2.a ORDER BY t2.a)
1,2
2,4
DROP TABLE t1, t2;
CREATE TABLE t1 (a char(4));
INSERT INTO t1 VALUES ('John'), ('Anna'), ('Bill');
SELECT GROUP_CONCAT(a SEPARATOR '||') AS names FROM t1
HAVING names LIKE '%An%';
names
John||Anna||Bill
SELECT GROUP_CONCAT(a SEPARATOR '###') AS names FROM t1
HAVING LEFT(names, 1) ='J';
names
John###Anna###Bill
DROP TABLE t1;
CREATE TABLE t1 ( a int, b TEXT );
INSERT INTO t1 VALUES (1,'First Row'), (2,'Second Row');
SELECT GROUP_CONCAT(b ORDER BY b) FROM t1 GROUP BY a;
GROUP_CONCAT(b ORDER BY b)
First Row
Second Row
DROP TABLE t1;
CREATE TABLE t1 (A_ID INT NOT NULL,A_DESC CHAR(3) NOT NULL,PRIMARY KEY (A_ID));
INSERT INTO t1 VALUES (1,'ABC'), (2,'EFG'), (3,'HIJ');
CREATE TABLE t2 (A_ID INT NOT NULL,B_DESC CHAR(3) NOT NULL,PRIMARY KEY (A_ID,B_DESC));
INSERT INTO t2 VALUES (1,'A'),(1,'B'),(3,'F');
SELECT t1.A_ID, GROUP_CONCAT(t2.B_DESC) AS B_DESC FROM t1 LEFT JOIN t2 ON t1.A_ID=t2.A_ID GROUP BY t1.A_ID ORDER BY t1.A_DESC;
A_ID B_DESC
1 A,B
2 NULL
3 F
DROP TABLE t1;
DROP TABLE t2;
create table t1 (a int, b text);
insert into t1 values (1, 'bb'), (1, 'ccc'), (1, 'a'), (1, 'bb'), (1, 'ccc');
insert into t1 values (2, 'BB'), (2, 'CCC'), (2, 'A'), (2, 'BB'), (2, 'CCC');
select group_concat(b) from t1 group by a;
group_concat(b)
bb,ccc,a,bb,ccc
BB,CCC,A,BB,CCC
select group_concat(distinct b) from t1 group by a;
group_concat(distinct b)
a,bb,ccc
A,BB,CCC
select group_concat(b order by b) from t1 group by a;
group_concat(b order by b)
a,bb,bb,ccc,ccc
A,BB,BB,CCC,CCC
select group_concat(distinct b order by b) from t1 group by a;
group_concat(distinct b order by b)
a,bb,ccc
A,BB,CCC
set local group_concat_max_len=4;
select group_concat(b) from t1 group by a;
group_concat(b)
bb,c
BB,C
Warnings:
Warning 1260 Row 2 was cut by GROUP_CONCAT()
Warning 1260 Row 4 was cut by GROUP_CONCAT()
select group_concat(distinct b) from t1 group by a;
group_concat(distinct b)
a,bb
A,BB
Warnings:
Warning 1260 Row 3 was cut by GROUP_CONCAT()
Warning 1260 Row 6 was cut by GROUP_CONCAT()
select group_concat(b order by b) from t1 group by a;
group_concat(b order by b)
a,bb
A,BB
Warnings:
Warning 1260 Row 3 was cut by GROUP_CONCAT()
Warning 1260 Row 6 was cut by GROUP_CONCAT()
select group_concat(distinct b order by b) from t1 group by a;
group_concat(distinct b order by b)
a,bb
A,BB
Warnings:
Warning 1260 Row 3 was cut by GROUP_CONCAT()
Warning 1260 Row 6 was cut by GROUP_CONCAT()
insert into t1 values (1, concat(repeat('1', 300), '2')),
(1, concat(repeat('1', 300), '2')), (1, concat(repeat('0', 300), '1')),
(2, concat(repeat('1', 300), '2')), (2, concat(repeat('1', 300), '2')),
(2, concat(repeat('0', 300), '1'));
set local group_concat_max_len=1024;
select group_concat(b) from t1 group by a;
group_concat(b)
bb,ccc,a,bb,ccc,1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111112,1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111112,0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001
BB,CCC,A,BB,CCC,1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111112,1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111112,0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001
select group_concat(distinct b) from t1 group by a;
group_concat(distinct b)
0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001,1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111112,a,bb,ccc
0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001,1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111112,A,BB,CCC
select group_concat(b order by b) from t1 group by a;
group_concat(b order by b)
0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001,1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111112,1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111112,a,bb,bb,ccc,ccc
0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001,1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111112,1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111112,A,BB,BB,CCC,CCC
select group_concat(distinct b order by b) from t1 group by a;
group_concat(distinct b order by b)
0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001,1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111112,a,bb,ccc
0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001,1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111112,A,BB,CCC
set local group_concat_max_len=400;
select group_concat(b) from t1 group by a;
group_concat(b)
bb,ccc,a,bb,ccc,1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111112,1111111111111111111111111111111111111111111111111111111111111111111111111111111111
BB,CCC,A,BB,CCC,1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111112,1111111111111111111111111111111111111111111111111111111111111111111111111111111111
Warnings:
Warning 1260 Row 7 was cut by GROUP_CONCAT()
Warning 1260 Row 14 was cut by GROUP_CONCAT()
select group_concat(distinct b) from t1 group by a;
group_concat(distinct b)
0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001,11111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111
0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001,11111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111
Warnings:
Warning 1260 Row 2 was cut by GROUP_CONCAT()
Warning 1260 Row 4 was cut by GROUP_CONCAT()
select group_concat(b order by b) from t1 group by a;
group_concat(b order by b)
0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001,11111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111
0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001,11111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111
Warnings:
Warning 1260 Row 2 was cut by GROUP_CONCAT()
Warning 1260 Row 4 was cut by GROUP_CONCAT()
select group_concat(distinct b order by b) from t1 group by a;
group_concat(distinct b order by b)
0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001,11111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111
0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001,11111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111
Warnings:
Warning 1260 Row 2 was cut by GROUP_CONCAT()
Warning 1260 Row 4 was cut by GROUP_CONCAT()
drop table t1;
create table t1 (a varchar(255) character set cp1250 collate cp1250_general_ci,
b varchar(255) character set koi8r);
insert into t1 values ('xxx','yyy');
select collation(a) from t1;
collation(a)
cp1250_general_ci
select collation(group_concat(a)) from t1;
collation(group_concat(a))
cp1250_general_ci
create table t2 select group_concat(a) as a from t1;
show create table t2;
Table Create Table
t2 CREATE TABLE `t2` (
`a` varchar(400) CHARACTER SET cp1250 COLLATE cp1250_general_ci DEFAULT NULL
) ENGINE=MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
select collation(group_concat(a,_koi8r'test')) from t1;
collation(group_concat(a,_koi8r'test'))
cp1250_general_ci
select collation(group_concat(a,_koi8r 0xC1C2)) from t1;
ERROR HY000: Illegal mix of collations (cp1250_general_ci,IMPLICIT) and (koi8r_general_ci,COERCIBLE) for operation 'group_concat('
select collation(group_concat(a,b)) from t1;
ERROR HY000: Illegal mix of collations (cp1250_general_ci,IMPLICIT) and (koi8r_general_ci,IMPLICIT) for operation 'group_concat('
drop table t1;
drop table t2;
CREATE TABLE t1 (a CHAR(10) CHARACTER SET cp850);
INSERT INTO t1 VALUES ('ภ');
SELECT a FROM t1;
a
ภ
SELECT GROUP_CONCAT(a) FROM t1;
GROUP_CONCAT(a)
ภ
DROP TABLE t1;
CREATE TABLE t1 (id int);
SELECT GROUP_CONCAT(id) AS gc FROM t1 HAVING gc IS NULL;
gc
NULL
DROP TABLE t1;
create table t2 (a int, b int);
insert into t2 values (1,1), (2,2);
select b x, (select group_concat(x) from t2) from t2;
x (select group_concat(x) from t2)
1 1,1
2 2,2
drop table t2;
create table t1 (d int not null auto_increment,primary key(d), a int, b int, c int);
insert into t1(a,b) values (1,3), (1,4), (1,2), (2,7), (1,1), (1,2), (2,3), (2,3);
select d,a,b from t1 order by a;
d a b
1 1 3
2 1 4
3 1 2
5 1 1
6 1 2
4 2 7
7 2 3
8 2 3
explain select a, group_concat(b) from t1 group by a with rollup;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 8 Using filesort
select a, group_concat(b) from t1 group by a with rollup;
a group_concat(b)
1 3,4,2,1,2
2 7,3,3
NULL 3,4,2,1,2,7,3,3
select a, group_concat(distinct b) from t1 group by a with rollup;
a group_concat(distinct b)
1 1,2,3,4
2 3,7
NULL 1,2,3,4,7
select a, group_concat(b order by b) from t1 group by a with rollup;
a group_concat(b order by b)
1 1,2,2,3,4
2 3,3,7
NULL 1,2,2,3,3,3,4,7
select a, group_concat(distinct b order by b) from t1 group by a with rollup;
a group_concat(distinct b order by b)
1 1,2,3,4
2 3,7
NULL 1,2,3,4,7
drop table t1;
create table t1 (a char(3), b char(20), primary key (a, b));
insert into t1 values ('ABW', 'Dutch'), ('ABW', 'English');
select group_concat(a) from t1 group by b;
group_concat(a)
ABW
ABW
drop table t1;
CREATE TABLE t1 (
aID smallint(5) unsigned NOT NULL auto_increment,
sometitle varchar(255) NOT NULL default '',
bID smallint(5) unsigned NOT NULL,
PRIMARY KEY (aID),
UNIQUE KEY sometitle (sometitle)
);
INSERT INTO t1 SET sometitle = 'title1', bID = 1;
INSERT INTO t1 SET sometitle = 'title2', bID = 1;
CREATE TABLE t2 (
bID smallint(5) unsigned NOT NULL auto_increment,
somename varchar(255) NOT NULL default '',
PRIMARY KEY (bID),
UNIQUE KEY somename (somename)
);
INSERT INTO t2 SET somename = 'test';
SELECT COUNT(*), GROUP_CONCAT(DISTINCT t2.somename SEPARATOR ' |')
FROM t1 JOIN t2 ON t1.bID = t2.bID;
COUNT(*) GROUP_CONCAT(DISTINCT t2.somename SEPARATOR ' |')
2 test
INSERT INTO t2 SET somename = 'test2';
SELECT COUNT(*), GROUP_CONCAT(DISTINCT t2.somename SEPARATOR ' |')
FROM t1 JOIN t2 ON t1.bID = t2.bID;
COUNT(*) GROUP_CONCAT(DISTINCT t2.somename SEPARATOR ' |')
2 test
DELETE FROM t2 WHERE somename = 'test2';
SELECT COUNT(*), GROUP_CONCAT(DISTINCT t2.somename SEPARATOR ' |')
FROM t1 JOIN t2 ON t1.bID = t2.bID;
COUNT(*) GROUP_CONCAT(DISTINCT t2.somename SEPARATOR ' |')
2 test
DROP TABLE t1,t2;
select * from (select group_concat('c') from DUAL) t;
group_concat('c')
c
create table t1 ( a int not null default 0);
select * from (select group_concat(a) from t1) t2;
group_concat(a)
NULL
select group_concat('x') UNION ALL select 1;
group_concat('x')
x
1
drop table t1;
CREATE TABLE t1 (id int, a varchar(9));
INSERT INTO t1 VALUES
(2, ''), (1, ''), (2, 'x'), (1, 'y'), (3, 'z'), (3, '');
SELECT GROUP_CONCAT(a) FROM t1;
GROUP_CONCAT(a)
,,x,y,z,
SELECT GROUP_CONCAT(a ORDER BY a) FROM t1;
GROUP_CONCAT(a ORDER BY a)
,,,x,y,z
SELECT GROUP_CONCAT(a) FROM t1 GROUP BY id;
GROUP_CONCAT(a)
,y
,x
z,
SELECT GROUP_CONCAT(a ORDER BY a) FROM t1 GROUP BY id;
GROUP_CONCAT(a ORDER BY a)
,y
,x
,z
DROP TABLE t1;
create table t1(f1 int);
insert into t1 values(1),(2),(3);
select f1, group_concat(f1+1) from t1 group by f1 with rollup;
f1 group_concat(f1+1)
1 2
2 3
3 4
NULL 2,3,4
select count(distinct (f1+1)) from t1 group by f1 with rollup;
count(distinct (f1+1))
1
1
1
3
drop table t1;
create table t1 (f1 int unsigned, f2 varchar(255));
insert into t1 values (1,repeat('a',255)),(2,repeat('b',255));
select f2,group_concat(f1) from t1 group by f2;
Catalog Database Table Table_alias Column Column_alias Type Length Max length Is_null Flags Decimals Charsetnr
def test t1 t1 f2 f2 253 255 255 Y 0 0 8
def group_concat(f1) 253 400 1 Y 0 0 8
f2 group_concat(f1)
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa 1
bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb 2
drop table t1;
set names latin1;
create table t1 (a char, b char);
insert into t1 values ('a', 'a'), ('a', 'b'), ('b', 'a'), ('b', 'b');
create table t2 select group_concat(b) as a from t1 where a = 'a';
create table t3 (select group_concat(a) as a from t1 where a = 'a') union
(select group_concat(b) as a from t1 where a = 'b');
select charset(a) from t2;
charset(a)
latin1
select charset(a) from t3;
charset(a)
latin1
latin1
drop table t1, t2, t3;
set names default;
create table t1 (c1 varchar(10), c2 int);
select charset(group_concat(c1 order by c2)) from t1;
charset(group_concat(c1 order by c2))
latin1
drop table t1;
CREATE TABLE t1 (a INT(10), b LONGTEXT, PRIMARY KEY (a));
SET GROUP_CONCAT_MAX_LEN = 20000000;
INSERT INTO t1 VALUES (1,REPEAT(CONCAT('A',CAST(CHAR(0) AS BINARY),'B'), 40000));
INSERT INTO t1 SELECT a + 1, b FROM t1;
SELECT a, CHAR_LENGTH(b) FROM t1;
a CHAR_LENGTH(b)
1 120000
2 120000
SELECT CHAR_LENGTH( GROUP_CONCAT(b) ) FROM t1;
CHAR_LENGTH( GROUP_CONCAT(b) )
240001
SET GROUP_CONCAT_MAX_LEN = 1024;
DROP TABLE t1;
CREATE TABLE t1 (a int, b int);
INSERT INTO t1 VALUES (2,1), (1,2), (2,2), (1,3);
SELECT GROUP_CONCAT(a), x
FROM (SELECT a, GROUP_CONCAT(b) x FROM t1 GROUP BY a) AS s
GROUP BY x;
GROUP_CONCAT(a) x
2 1,2
1 2,3
DROP TABLE t1;
set names utf8;
create table t1
(
x text character set utf8 not null,
y integer not null
);
insert into t1 values (repeat('a', 1022), 0), (repeat(_utf8 0xc3b7, 4), 0);
set group_concat_max_len= 1022 + 10;
select @x:=group_concat(x) from t1 group by y;
select @@group_concat_max_len, length(@x), char_length(@x), right(@x,12), right(HEX(@x),12);
@@group_concat_max_len length(@x) char_length(@x) right(@x,12) right(HEX(@x),12)
1032 1031 1027 aaaaaaa,รทรทรทรท C3B7C3B7C3B7
set group_concat_max_len= 1022 + 9;
select @x:=group_concat(x) from t1 group by y;
select @@group_concat_max_len, length(@x), char_length(@x), right(@x,12), right(HEX(@x),12);
@@group_concat_max_len length(@x) char_length(@x) right(@x,12) right(HEX(@x),12)
1031 1031 1027 aaaaaaa,รทรทรทรท C3B7C3B7C3B7
set group_concat_max_len= 1022 + 8;
select @x:=group_concat(x) from t1 group by y;
select @@group_concat_max_len, length(@x), char_length(@x), right(@x,12), right(HEX(@x),12);
@@group_concat_max_len length(@x) char_length(@x) right(@x,12) right(HEX(@x),12)
1030 1029 1026 aaaaaaaa,รทรทรท C3B7C3B7C3B7
set group_concat_max_len= 1022 + 7;
select @x:=group_concat(x) from t1 group by y;
select @@group_concat_max_len, length(@x), char_length(@x), right(@x,12), right(HEX(@x),12);
@@group_concat_max_len length(@x) char_length(@x) right(@x,12) right(HEX(@x),12)
1029 1029 1026 aaaaaaaa,รทรทรท C3B7C3B7C3B7
set group_concat_max_len= 1022 + 6;
select @x:=group_concat(x) from t1 group by y;
select @@group_concat_max_len, length(@x), char_length(@x), right(@x,12), right(HEX(@x),12);
@@group_concat_max_len length(@x) char_length(@x) right(@x,12) right(HEX(@x),12)
1028 1027 1025 aaaaaaaaa,รทรท 612CC3B7C3B7
set group_concat_max_len= 1022 + 5;
select @x:=group_concat(x) from t1 group by y;
select @@group_concat_max_len, length(@x), char_length(@x), right(@x,12), right(HEX(@x),12);
@@group_concat_max_len length(@x) char_length(@x) right(@x,12) right(HEX(@x),12)
1027 1027 1025 aaaaaaaaa,รทรท 612CC3B7C3B7
set group_concat_max_len= 1022 + 4;
select @x:=group_concat(x) from t1 group by y;
select @@group_concat_max_len, length(@x), char_length(@x), right(@x,12), right(HEX(@x),12);
@@group_concat_max_len length(@x) char_length(@x) right(@x,12) right(HEX(@x),12)
1026 1025 1024 aaaaaaaaaa,รท 6161612CC3B7
set group_concat_max_len= 1022 + 3;
select @x:=group_concat(x) from t1 group by y;
select @@group_concat_max_len, length(@x), char_length(@x), right(@x,12), right(HEX(@x),12);
@@group_concat_max_len length(@x) char_length(@x) right(@x,12) right(HEX(@x),12)
1025 1025 1024 aaaaaaaaaa,รท 6161612CC3B7
set group_concat_max_len= 1022 + 2;
select @x:=group_concat(x) from t1 group by y;
select @@group_concat_max_len, length(@x), char_length(@x), right(@x,12), right(HEX(@x),12);
@@group_concat_max_len length(@x) char_length(@x) right(@x,12) right(HEX(@x),12)
1024 1023 1023 aaaaaaaaaaa, 61616161612C
set group_concat_max_len= 1022 + 1;
select @x:=group_concat(x) from t1 group by y;
select @@group_concat_max_len, length(@x), char_length(@x), right(@x,12), right(HEX(@x),12);
@@group_concat_max_len length(@x) char_length(@x) right(@x,12) right(HEX(@x),12)
1023 1023 1023 aaaaaaaaaaa, 61616161612C
drop table t1;
set group_concat_max_len=1024;
set names latin1;
create table t1 (f1 int unsigned, f2 varchar(255));
insert into t1 values (1,repeat('a',255)),(2,repeat('b',255));
select f2,group_concat(f1) from t1 group by f2;
Catalog Database Table Table_alias Column Column_alias Type Length Max length Is_null Flags Decimals Charsetnr
def test t1 t1 f2 f2 253 255 255 Y 0 0 8
def group_concat(f1) 252 1024 1 Y 0 0 8
f2 group_concat(f1)
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa 1
bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb 2
drop table t1;
CREATE TABLE t1(a TEXT, b CHAR(20));
INSERT INTO t1 VALUES ("one.1","one.1"),("two.2","two.2"),("one.3","one.3");
SELECT GROUP_CONCAT(DISTINCT UCASE(a)) FROM t1;
GROUP_CONCAT(DISTINCT UCASE(a))
ONE.1,ONE.3,TWO.2
SELECT GROUP_CONCAT(DISTINCT UCASE(b)) FROM t1;
GROUP_CONCAT(DISTINCT UCASE(b))
ONE.1,ONE.3,TWO.2
DROP TABLE t1;
CREATE TABLE t1( a VARCHAR( 10 ), b INT );
INSERT INTO t1 VALUES ( repeat( 'a', 10 ), 1),
( repeat( 'b', 10 ), 2);
SET group_concat_max_len = 20;
SELECT GROUP_CONCAT( a ) FROM t1;
GROUP_CONCAT( a )
aaaaaaaaaa,bbbbbbbbb
Warnings:
Warning 1260 Row 2 was cut by GROUP_CONCAT()
SELECT GROUP_CONCAT( DISTINCT a ) FROM t1;
GROUP_CONCAT( DISTINCT a )
aaaaaaaaaa,bbbbbbbbb
Warnings:
Warning 1260 Row 2 was cut by GROUP_CONCAT()
SELECT GROUP_CONCAT( a ORDER BY b ) FROM t1;
GROUP_CONCAT( a ORDER BY b )
aaaaaaaaaa,bbbbbbbbb
Warnings:
Warning 1260 Row 2 was cut by GROUP_CONCAT()
SELECT GROUP_CONCAT( DISTINCT a ORDER BY b ) FROM t1;
GROUP_CONCAT( DISTINCT a ORDER BY b )
aaaaaaaaaa,bbbbbbbbb
Warnings:
Warning 1260 Row 2 was cut by GROUP_CONCAT()
SET group_concat_max_len = DEFAULT;
DROP TABLE t1;
SET group_concat_max_len= 65535;
CREATE TABLE t1( a TEXT, b INTEGER );
INSERT INTO t1 VALUES ( 'a', 0 ), ( 'b', 1 );
SELECT GROUP_CONCAT( a ORDER BY b ) FROM t1;
GROUP_CONCAT( a ORDER BY b )
a,b
SELECT GROUP_CONCAT(DISTINCT a ORDER BY b) FROM t1;
GROUP_CONCAT(DISTINCT a ORDER BY b)
a,b
SELECT GROUP_CONCAT(DISTINCT a) FROM t1;
GROUP_CONCAT(DISTINCT a)
a,b
SET group_concat_max_len= 10;
SELECT GROUP_CONCAT(a ORDER BY b) FROM t1;
GROUP_CONCAT(a ORDER BY b)
a,b
SELECT GROUP_CONCAT(DISTINCT a ORDER BY b) FROM t1;
GROUP_CONCAT(DISTINCT a ORDER BY b)
a,b
SELECT GROUP_CONCAT(DISTINCT a) FROM t1;
GROUP_CONCAT(DISTINCT a)
a,b
SET group_concat_max_len= 65535;
CREATE TABLE t2( a TEXT );
INSERT INTO t2 VALUES( REPEAT( 'a', 5000 ) );
INSERT INTO t2 VALUES( REPEAT( 'b', 5000 ) );
INSERT INTO t2 VALUES( REPEAT( 'a', 5000 ) );
SELECT LENGTH( GROUP_CONCAT( DISTINCT a ) ) FROM t2;
LENGTH( GROUP_CONCAT( DISTINCT a ) )
10001
CREATE TABLE t3( a TEXT, b INT );
INSERT INTO t3 VALUES( REPEAT( 'a', 65534 ), 1 );
INSERT INTO t3 VALUES( REPEAT( 'a', 65535 ), 2 );
INSERT IGNORE INTO t3 VALUES( REPEAT( 'a', 65536 ), 3 );
Warnings:
Warning 1265 Data truncated for column 'a' at row 1
SELECT LENGTH( GROUP_CONCAT( a ) ) FROM t3 WHERE b = 1;
LENGTH( GROUP_CONCAT( a ) )
65534
SELECT LENGTH( GROUP_CONCAT( a ) ) FROM t3 WHERE b = 2;
LENGTH( GROUP_CONCAT( a ) )
65535
SELECT LENGTH( GROUP_CONCAT( a ) ) FROM t3 WHERE b = 3;
LENGTH( GROUP_CONCAT( a ) )
65535
SET group_concat_max_len= DEFAULT;
DROP TABLE t1, t2, t3;
set names latin1;
create table t1 (id int, name varchar(20)) DEFAULT CHARSET=utf8;
insert into t1 (id, name) values (1, "๓ra");
insert into t1 (id, name) values (2, "๓ra");
select b.id, group_concat(b.name) from t1 a, t1 b group by b.id;
id group_concat(b.name)
1 ๓ra,๓ra
2 ๓ra,๓ra
drop table t1;
create table t1(a bit not null);
insert ignore into t1 values (), (), ();
Warnings:
Warning 1364 Field 'a' doesn't have a default value
select group_concat(distinct a) from t1;
group_concat(distinct a)
0
select group_concat(distinct a order by a) from t1;
group_concat(distinct a order by a)
0
drop table t1;
create table t1(a bit(2) not null);
insert into t1 values (1), (0), (0), (3), (1);
select group_concat(distinct a) from t1;
group_concat(distinct a)
0,1,3
select group_concat(distinct a order by a) from t1;
group_concat(distinct a order by a)
0,1,3
select group_concat(distinct a order by a desc) from t1;
group_concat(distinct a order by a desc)
3,1,0
drop table t1;
create table t1(a bit(2), b varchar(10), c bit);
insert into t1 values (1, 'a', 0), (0, 'b', 1), (0, 'c', 0), (3, 'd', 1),
(1, 'e', 1), (3, 'f', 1), (0, 'g', 1);
select group_concat(distinct a, c) from t1;
group_concat(distinct a, c)
00,01,10,11,31
select group_concat(distinct a, c order by a) from t1;
group_concat(distinct a, c order by a)
00,01,11,10,31
select group_concat(distinct a, c) from t1;
group_concat(distinct a, c)
00,01,10,11,31
select group_concat(distinct a, c order by a, c) from t1;
group_concat(distinct a, c order by a, c)
00,01,10,11,31
select group_concat(distinct a, c order by a desc, c desc) from t1;
group_concat(distinct a, c order by a desc, c desc)
31,11,10,01,00
drop table t1;
create table t1 (f1 char(20));
insert into t1 values (''),('');
select group_concat(distinct f1) from t1;
group_concat(distinct f1)
select group_concat(f1) from t1;
group_concat(f1)
,
drop table t1;
CREATE TABLE t1 (a INT, b INT);
INSERT INTO t1 VALUES (1, 1), (2, 2), (2, 3);
SELECT GROUP_CONCAT(DISTINCT a ORDER BY b) FROM t1;
GROUP_CONCAT(DISTINCT a ORDER BY b)
1,2
SELECT GROUP_CONCAT(DISTINCT a ORDER BY b DESC) FROM t1;
GROUP_CONCAT(DISTINCT a ORDER BY b DESC)
2,1
SELECT GROUP_CONCAT(DISTINCT a) FROM t1;
GROUP_CONCAT(DISTINCT a)
1,2
SELECT GROUP_CONCAT(DISTINCT a + 1 ORDER BY 3 - b) FROM t1;
GROUP_CONCAT(DISTINCT a + 1 ORDER BY 3 - b)
3,2
SELECT GROUP_CONCAT(DISTINCT a + 1 ORDER BY b) FROM t1;
GROUP_CONCAT(DISTINCT a + 1 ORDER BY b)
2,3
SELECT GROUP_CONCAT(a ORDER BY 3 - b) FROM t1;
GROUP_CONCAT(a ORDER BY 3 - b)
2,2,1
CREATE TABLE t2 (a INT, b INT, c INT, d INT);
INSERT INTO t2 VALUES (1,1, 1,1), (1,1, 2,2), (1,2, 2,1), (2,1, 1,2);
SELECT GROUP_CONCAT(DISTINCT a, b ORDER BY c, d) FROM t2;
GROUP_CONCAT(DISTINCT a, b ORDER BY c, d)
11,21,12
SELECT GROUP_CONCAT(DISTINCT a, b ORDER BY d, c) FROM t2;
GROUP_CONCAT(DISTINCT a, b ORDER BY d, c)
11,12,21
CREATE TABLE t3 (a INT, b INT, c INT);
INSERT INTO t3 VALUES (1, 1, 1), (2, 1, 2), (3, 2, 1);
SELECT GROUP_CONCAT(DISTINCT a, b ORDER BY b, c) FROM t3;
GROUP_CONCAT(DISTINCT a, b ORDER BY b, c)
11,21,32
SELECT GROUP_CONCAT(DISTINCT a, b ORDER BY c, b) FROM t3;
GROUP_CONCAT(DISTINCT a, b ORDER BY c, b)
11,32,21
SELECT GROUP_CONCAT(DISTINCT a, b ORDER BY a, b) FROM t1;
GROUP_CONCAT(DISTINCT a, b ORDER BY a, b)
11,22,23
SELECT GROUP_CONCAT(DISTINCT b, a ORDER BY a, b) FROM t1;
GROUP_CONCAT(DISTINCT b, a ORDER BY a, b)
11,22,32
SELECT GROUP_CONCAT(DISTINCT a, b ORDER BY b, a) FROM t1;
GROUP_CONCAT(DISTINCT a, b ORDER BY b, a)
11,22,23
SELECT GROUP_CONCAT(DISTINCT b, a ORDER BY a, b) FROM t1;
GROUP_CONCAT(DISTINCT b, a ORDER BY a, b)
11,22,32
SELECT GROUP_CONCAT(DISTINCT a ORDER BY a, b) FROM t1;
GROUP_CONCAT(DISTINCT a ORDER BY a, b)
1,2
SELECT GROUP_CONCAT(DISTINCT b ORDER BY b, a) FROM t1;
GROUP_CONCAT(DISTINCT b ORDER BY b, a)
1,2,3
SELECT GROUP_CONCAT(DISTINCT a, b ORDER BY a) FROM t1;
GROUP_CONCAT(DISTINCT a, b ORDER BY a)
11,23,22
SELECT GROUP_CONCAT(DISTINCT b, a ORDER BY b) FROM t1;
GROUP_CONCAT(DISTINCT b, a ORDER BY b)
11,22,32
DROP TABLE t1, t2, t3;
CREATE TABLE t1(a INT);
INSERT INTO t1 VALUES (),();
SELECT s1.d1 FROM
(
SELECT
t1.a as d1,
GROUP_CONCAT(DISTINCT t1.a) AS d2
FROM
t1 AS t1,
t1 AS t2
GROUP BY 1
) AS s1;
d1
NULL
DROP TABLE t1;
CREATE TABLE t1 (a INT);
CREATE TABLE t2 (a INT);
INSERT INTO t1 VALUES(1);
SELECT GROUP_CONCAT(DISTINCT t2.a) FROM t1 LEFT JOIN t2 ON t2.a = t1.a GROUP BY t1.a;
GROUP_CONCAT(DISTINCT t2.a)
NULL
DROP TABLE t1, t2;
CREATE TABLE t1 (a INT, KEY(a));
CREATE TABLE t2 (b INT);
INSERT INTO t1 VALUES (NULL), (8), (2);
INSERT INTO t2 VALUES (4), (10);
SELECT 1 FROM t1 WHERE t1.a NOT IN
(
SELECT GROUP_CONCAT(DISTINCT t1.a)
FROM t1 WHERE t1.a IN
(
SELECT b FROM t2
)
AND NOT t1.a >= (SELECT t1.a FROM t1 LIMIT 1)
GROUP BY t1.a
);
1
1
1
1
DROP TABLE t1, t2;
CREATE TABLE t1 (f1 INT);
INSERT INTO t1 VALUES (),();
EXPLAIN EXTENDED SELECT 1 FROM
(SELECT DISTINCT GROUP_CONCAT(td.f1) FROM t1,t1 AS td GROUP BY td.f1) AS d,t1;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 2 100.00
1 PRIMARY <derived2> ALL NULL NULL NULL NULL 4 100.00 Using join buffer (flat, BNL join)
2 DERIVED t1 ALL NULL NULL NULL NULL 2 100.00 Using temporary; Using filesort
2 DERIVED td ALL NULL NULL NULL NULL 2 100.00 Using join buffer (flat, BNL join)
Warnings:
Note 1003 /* select#1 */ select 1 AS `1` from (/* select#2 */ select distinct group_concat(`test`.`td`.`f1` separator ',') AS `GROUP_CONCAT(td.f1)` from `test`.`t1` join `test`.`t1` `td` group by `test`.`td`.`f1`) `d` join `test`.`t1`
SELECT 1 FROM
(SELECT DISTINCT GROUP_CONCAT(td.f1) FROM t1,t1 AS td GROUP BY td.f1) AS d,t1;
1
1
1
DROP TABLE t1;
End of 5.0 tests
#
# Bug #52397: another crash with explain extended and group_concat
#
CREATE TABLE t1 (a INT);
INSERT INTO t1 VALUES (0), (0);
EXPLAIN EXTENDED SELECT 1 FROM
(SELECT GROUP_CONCAT(t1.a ORDER BY t1.a ASC) FROM
t1 t2, t1 GROUP BY t1.a) AS d;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY <derived2> ALL NULL NULL NULL NULL 4 100.00
2 DERIVED t2 ALL NULL NULL NULL NULL 2 100.00 Using temporary; Using filesort
2 DERIVED t1 ALL NULL NULL NULL NULL 2 100.00 Using join buffer (flat, BNL join)
Warnings:
Note 1003 /* select#1 */ select 1 AS `1` from (/* select#2 */ select group_concat(`test`.`t1`.`a` order by `test`.`t1`.`a` ASC separator ',') AS `GROUP_CONCAT(t1.a ORDER BY t1.a ASC)` from `test`.`t1` `t2` join `test`.`t1` group by `test`.`t1`.`a`) `d`
DROP TABLE t1;
End of 5.0 tests
#
# Bug #54476: crash when group_concat and 'with rollup' in prepared statements
#
CREATE TABLE t1 (a INT);
INSERT INTO t1 VALUES (1), (2);
PREPARE stmt FROM "SELECT GROUP_CONCAT(t1.a ORDER BY t1.a) FROM t1 JOIN t1 t2 GROUP BY t1.a WITH ROLLUP";
EXECUTE stmt;
GROUP_CONCAT(t1.a ORDER BY t1.a)
1,1
2,2
1,1,2,2
EXECUTE stmt;
GROUP_CONCAT(t1.a ORDER BY t1.a)
1,1
2,2
1,1,2,2
DEALLOCATE PREPARE stmt;
DROP TABLE t1;
#
# Bug#57194 group_concat cause crash and/or invalid memory reads with type errors
#
CREATE TABLE t1(f1 int);
INSERT INTO t1 values (0),(0);
SELECT POLYGON((SELECT 1 FROM (SELECT 1 IN (GROUP_CONCAT(t1.f1)) FROM t1, t1 t GROUP BY t.f1 ) d));
ERROR HY000: Illegal parameter data type int for operation 'polygon'
DROP TABLE t1;
#
# Bug#58396 group_concat and explain extended are still crashy
#
CREATE TABLE t1(a INT);
EXPLAIN EXTENDED SELECT UPDATEXML('1', a, '1')
FROM t1 ORDER BY (SELECT GROUP_CONCAT(1) FROM t1);
ERROR HY000: Only constant XPATH queries are supported
SHOW WARNINGS;
Level Code Message
Error 1105 Only constant XPATH queries are supported
DROP TABLE t1;
End of 5.1 tests
DROP TABLE IF EXISTS t1, t2;
CREATE TABLE t1 (a VARCHAR(6), b INT);
CREATE TABLE t2 (a VARCHAR(6), b INT);
INSERT INTO t1 VALUES ('111111', 1);
INSERT INTO t1 VALUES ('222222', 2);
INSERT INTO t1 VALUES ('333333', 3);
INSERT INTO t1 VALUES ('444444', 4);
INSERT INTO t1 VALUES ('555555', 5);
SET group_concat_max_len = 5;
SET @old_sql_mode = @@sql_mode, @@sql_mode = 'traditional';
SELECT GROUP_CONCAT(a), b FROM t1 GROUP BY b LIMIT 3;
GROUP_CONCAT(a) b
11111 1
22222 2
33333 3
Warnings:
Warning 1260 Row 1 was cut by GROUP_CONCAT()
Warning 1260 Row 2 was cut by GROUP_CONCAT()
Warning 1260 Row 3 was cut by GROUP_CONCAT()
INSERT INTO t2 SELECT GROUP_CONCAT(a), b FROM t1 GROUP BY b;
ERROR HY000: Row 1 was cut by GROUP_CONCAT()
UPDATE t1 SET a = '11111' WHERE b = 1;
UPDATE t1 SET a = '22222' WHERE b = 2;
INSERT INTO t2 SELECT GROUP_CONCAT(a), b FROM t1 GROUP BY b;
ERROR HY000: Row 3 was cut by GROUP_CONCAT()
SET group_concat_max_len = DEFAULT;
SET @@sql_mode = @old_sql_mode;
DROP TABLE t1, t2;
create table t1 (a char(1) character set utf8);
insert into t1 values ('a'),('b');
select 1 from t1 where a in (select group_concat(a) from t1);
1
drop table t1;
CREATE TABLE t1 (f1 VARCHAR(10)) ENGINE=MyISAM;
INSERT INTO t1 VALUES ('a'),('b');
CREATE TABLE t2 (f2 VARCHAR(10)) ENGINE=MyISAM;
INSERT INTO t2 VALUES ('c');
CREATE TABLE t3 (f3 VARCHAR(10)) ENGINE=MyISAM;
INSERT INTO t3 VALUES ('d'),('e');
SELECT GROUP_CONCAT( f2 ORDER BY ( f2 IN ( SELECT f1 FROM t1 WHERE f1 <= f2 ) ) ) AS field
FROM ( SELECT * FROM t2 ) AS sq2, t3
ORDER BY field;
field
c,c
drop table t3, t2, t1;
#
# MDEV-7821 - Server crashes in Item_func_group_concat::fix_fields on 2nd
# execution of PS
#
CREATE TABLE t1(a INT);
INSERT INTO t1 VALUES(1),(2);
PREPARE stmt FROM "SELECT GROUP_CONCAT(t1a.a ORDER BY 1, t1a.a=0) FROM t1 AS t1a, t1 AS t1b GROUP BY t1a.a";
EXECUTE stmt;
GROUP_CONCAT(t1a.a ORDER BY 1, t1a.a=0)
1,1
2,2
EXECUTE stmt;
GROUP_CONCAT(t1a.a ORDER BY 1, t1a.a=0)
1,1
2,2
DROP TABLE t1;
#
# WL#6098 Eliminate GROUP_CONCAT intermediate result limitation.
# Bug#13387020 GROUP_CONCAT WITH ORDER BY RESULTS ARE TRUNCATED.
#
SET group_concat_max_len= 9999999;
CREATE TABLE t1 (f1 LONGTEXT , f2 INTEGER);
INSERT INTO t1 VALUES (REPEAT('a', 500000), 0), (REPEAT('b', 500000), 1), (REPEAT('c', 500000), 2);
SELECT LENGTH(GROUP_CONCAT(f1 ORDER BY f2)) FROM t1;
LENGTH(GROUP_CONCAT(f1 ORDER BY f2))
1500002
SELECT LENGTH(GROUP_CONCAT(DISTINCT f1 ORDER BY f1 DESC)) FROM t1;
LENGTH(GROUP_CONCAT(DISTINCT f1 ORDER BY f1 DESC))
1500002
SELECT SUBSTRING(GROUP_CONCAT(DISTINCT f1 ORDER BY f1 DESC), 1, 5) FROM t1;
SUBSTRING(GROUP_CONCAT(DISTINCT f1 ORDER BY f1 DESC), 1, 5)
ccccc
SELECT LENGTH(GROUP_CONCAT(DISTINCT f1)) FROM t1;
LENGTH(GROUP_CONCAT(DISTINCT f1))
1500002
SELECT LENGTH(GROUP_CONCAT(UPPER(f1) ORDER BY f2)) FROM t1;
LENGTH(GROUP_CONCAT(UPPER(f1) ORDER BY f2))
1500002
SELECT LENGTH(GROUP_CONCAT(DISTINCT UPPER(f1) ORDER BY f1)) FROM t1;
LENGTH(GROUP_CONCAT(DISTINCT UPPER(f1) ORDER BY f1))
1500002
SELECT SUBSTRING(GROUP_CONCAT(DISTINCT UPPER(f1) ORDER BY f1), 1, 5) FROM t1;
SUBSTRING(GROUP_CONCAT(DISTINCT UPPER(f1) ORDER BY f1), 1, 5)
AAAAA
SELECT LENGTH(GROUP_CONCAT(DISTINCT UPPER(f1))) FROM t1;
LENGTH(GROUP_CONCAT(DISTINCT UPPER(f1)))
1500002
CREATE TABLE t2 SELECT GROUP_CONCAT(f1 order by f2) FROM t1;
SHOW CREATE TABLE t2;
Table Create Table
t2 CREATE TABLE `t2` (
`GROUP_CONCAT(f1 order by f2)` mediumtext DEFAULT NULL
) ENGINE=MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
DROP TABLE t2;
CREATE TABLE t2 SELECT GROUP_CONCAT(UPPER(f1) ORDER BY f2) FROM t1;
SHOW CREATE TABLE t2;
Table Create Table
t2 CREATE TABLE `t2` (
`GROUP_CONCAT(UPPER(f1) ORDER BY f2)` mediumtext DEFAULT NULL
) ENGINE=MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
DROP TABLE t2;
SET group_concat_max_len= 1024;
SELECT LENGTH(GROUP_CONCAT(f1 ORDER BY f2)) FROM t1;
LENGTH(GROUP_CONCAT(f1 ORDER BY f2))
1024
Warnings:
Warning 1260 Row 2 was cut by GROUP_CONCAT()
SET group_concat_max_len= 499999;
SELECT LENGTH(GROUP_CONCAT(f1 ORDER BY f2)) FROM t1 WHERE f2 = 0;
LENGTH(GROUP_CONCAT(f1 ORDER BY f2))
499999
Warnings:
Warning 1260 Row 1 was cut by GROUP_CONCAT()
SELECT LENGTH(GROUP_CONCAT(f1 ORDER BY f2)) FROM t1 GROUP BY f2;
LENGTH(GROUP_CONCAT(f1 ORDER BY f2))
499999
499999
499999
Warnings:
Warning 1260 Row 1 was cut by GROUP_CONCAT()
Warning 1260 Row 2 was cut by GROUP_CONCAT()
Warning 1260 Row 3 was cut by GROUP_CONCAT()
INSERT INTO t1 VALUES (REPEAT('a', 499999), 3), (REPEAT('b', 500000), 4);
SELECT LENGTH(GROUP_CONCAT(f1 ORDER BY f2)) FROM t1 GROUP BY f2;
LENGTH(GROUP_CONCAT(f1 ORDER BY f2))
499999
499999
499999
499999
499999
Warnings:
Warning 1260 Row 1 was cut by GROUP_CONCAT()
Warning 1260 Row 2 was cut by GROUP_CONCAT()
Warning 1260 Row 3 was cut by GROUP_CONCAT()
Warning 1260 Row 5 was cut by GROUP_CONCAT()
DROP TABLE t1;
SET group_concat_max_len= DEFAULT;
set session group_concat_max_len=1024;
set max_session_mem_used=16*1024*1024;
SELECT GROUP_CONCAT(concat(seq/1.1), concat(seq/1.1), concat(seq/1.1), concat(seq/1.1), concat(seq/1.1), concat(seq/1.1), concat(seq/1.1), concat(seq/1.1) ORDER BY 2,1,3,4,6,5,8,7) AS c
FROM seq_1_to_200000;
c
0.90910.90910.90910.90910.90910.90910.90910.9091,1.81821.81821.81821.81821.81821.81821.81821.8182,10.000010.000010.000010.000010.000010.000010.000010.0000,10.909110.909110.909110.909110.909110.909110.909110.9091,100.0000100.0000100.0000100.0000100.0000100.0000100.0000100.0000,100.9091100.9091100.9091100.9091100.9091100.9091100.9091100.9091,1000.00001000.00001000.00001000.00001000.00001000.00001000.00001000.0000,1000.90911000.90911000.90911000.90911000.90911000.90911000.90911000.9091,10000.000010000.000010000.000010000.000010000.000010000.000010000.000010000.0000,10000.909110000.909110000.909110000.909110000.909110000.909110000.909110000.9091,100000.0000100000.0000100000.0000100000.0000100000.0000100000.0000100000.0000100000.0000,100000.9091100000.9091100000.9091100000.9091100000.9091100000.9091100000.9091100000.9091,100001.8182100001.8182100001.8182100001.8182100001.8182100001.8182100001.8182100001.8182,100002.7273100002.7273100002.7273100002.7273100002.7273100002.7273100002.7273100002.7273,100003.6364100003.
Warnings:
Warning 1260 Row 15 was cut by GROUP_CONCAT()
set max_session_mem_used=default;
set session group_concat_max_len=default;
SET group_concat_max_len= 8;
CREATE TABLE t1 (a INT);
INSERT t1 VALUES (1),(2);
CREATE TABLE t2 (b DATE, c INT);
INSERT t2 VALUES ('2019-12-04',1),('2020-03-28',2);
CREATE TABLE t3 (d INT);
INSERT t3 VALUES (1),(2),(3),(4),(5),(6),(7),(8),(9),(10),(11),(12),(13),(14);
CREATE TABLE t4 (e INT);
INSERT t4 VALUES (1),(2),(3),(4),(5),(6),(7),(8),(9),(10),(11),(12),(13),(14),(15);
SELECT (SELECT MAX(a) FROM t1 WHERE t2_sq.c > 0) AS f,
GROUP_CONCAT(t2_sq.b ORDER BY 1) AS gc
FROM (SELECT t2_a.* FROM t2 AS t2_a, t2 AS t2_b) AS t2_sq, t3, t4
GROUP BY f;
f gc
2 2019-12-
Warnings:
Warning 1260 Row 1 was cut by GROUP_CONCAT()
DROP TABLE t1, t2, t3, t4;
SET group_concat_max_len= default;
#
# Start of 10.2 tests
#
#
# MDEV-10124 Incorrect usage of CUBE/ROLLUP and ORDER BY with GROUP_CONCAT(a ORDER BY a)
#
CREATE TABLE t1 (a INT);
INSERT INTO t1 VALUES (10),(20),(30);
SELECT a,GROUP_CONCAT(a ORDER BY a) FROM t1 GROUP BY a WITH ROLLUP;
a GROUP_CONCAT(a ORDER BY a)
10 10
20 20
30 30
NULL 10,20,30
CREATE VIEW v1 AS
SELECT a,GROUP_CONCAT(a ORDER BY a) FROM t1 GROUP BY a WITH ROLLUP;
SELECT * FROM v1;
a GROUP_CONCAT(a ORDER BY a)
10 10
20 20
30 30
NULL 10,20,30
DROP VIEW v1;
SELECT a,GROUP_CONCAT(a ORDER BY a) FROM t1 GROUP BY a WITH ROLLUP HAVING GROUP_CONCAT(a ORDER BY a)='10,20,30';
a GROUP_CONCAT(a ORDER BY a)
NULL 10,20,30
CREATE VIEW v1 AS
SELECT a,GROUP_CONCAT(a ORDER BY a) FROM t1 GROUP BY a WITH ROLLUP HAVING GROUP_CONCAT(a ORDER BY a)='10,20,30';
SELECT * FROM v1;
a GROUP_CONCAT(a ORDER BY a)
NULL 10,20,30
DROP VIEW v1;
SELECT * FROM (SELECT a,GROUP_CONCAT(a ORDER BY a) FROM t1 GROUP BY a WITH ROLLUP HAVING GROUP_CONCAT(a ORDER BY a)='10,20,30') t1;
a GROUP_CONCAT(a ORDER BY a)
NULL 10,20,30
CREATE VIEW v1 AS
SELECT * FROM (SELECT a,GROUP_CONCAT(a ORDER BY a) FROM t1 GROUP BY a WITH ROLLUP HAVING GROUP_CONCAT(a ORDER BY a)='10,20,30') t1;
SELECT * FROM v1;
a GROUP_CONCAT(a ORDER BY a)
NULL 10,20,30
DROP VIEW v1;
SELECT (SELECT GROUP_CONCAT(a ORDER BY a) FROM t1 GROUP BY a WITH ROLLUP HAVING GROUP_CONCAT(a ORDER BY a)='10,20,30');
(SELECT GROUP_CONCAT(a ORDER BY a) FROM t1 GROUP BY a WITH ROLLUP HAVING GROUP_CONCAT(a ORDER BY a)='10,20,30')
10,20,30
CREATE VIEW v1 AS
SELECT (SELECT GROUP_CONCAT(a ORDER BY a) FROM t1 GROUP BY a WITH ROLLUP HAVING GROUP_CONCAT(a ORDER BY a)='10,20,30');
SELECT * FROM v1;
Name_exp_1
10,20,30
DROP VIEW v1;
DROP TABLE t1;
#
# MDEV-4677 GROUP_CONCAT not showing any output with group_concat_max_len >= 4Gb
#
set group_concat_max_len=1024*1024*1024*4;
Warnings:
Warning 1292 Truncated incorrect group_concat_max_len value: '4294967296'
create table t1 (i int, j int);
insert into t1 values (1,1),(1,2);
select i, group_concat(j) from t1 group by i;
i group_concat(j)
1 1,2
drop table t1;
#
# End of 10.2 tests
#
#
# Start of 10.3 tests
#
drop table if exists t1, t2;
create table t1 (grp int, a bigint unsigned, c char(10) , d char(10) not null);
insert into t1 values (1,1,NULL,"a");
insert into t1 values (1,10,"b","a");
insert into t1 values (1,11,"c","a");
insert into t1 values (2,2,"c","a");
insert into t1 values (2,3,"b","b");
insert into t1 values (3,4,"E","a");
insert into t1 values (3,5,"C","b");
insert into t1 values (3,6,"D","c");
insert into t1 values (3,7,"E","c");
select grp,group_concat(c) from t1 group by grp;
grp group_concat(c)
1 b,c
2 c,b
3 E,C,D,E
select grp,group_concat(c limit 1 ) from t1 group by grp;
grp group_concat(c limit 1 )
1 b
2 c
3 E
select grp,group_concat(c limit 1,1 ) from t1 group by grp;
grp group_concat(c limit 1,1 )
1 c
2 b
3 C
select grp,group_concat(c limit 1,10 ) from t1 group by grp;
grp group_concat(c limit 1,10 )
1 c
2 b
3 C,D,E
select grp,group_concat(c limit 1000) from t1 group by grp;
grp group_concat(c limit 1000)
1 b,c
2 c,b
3 E,C,D,E
select group_concat(grp limit 0) from t1;
group_concat(grp limit 0)
select group_concat(grp limit "sdjadjs") from t1
--error ER_PARSE_ERROR
select grp,group_concat(c limit 5.5) from t1 group by grp ;
ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near '"sdjadjs") from t1
--error ER_PARSE_ERROR
select grp,group_concat(c limit 5.5...' at line 1
select grp,group_concat(distinct c limit 1,10 ) from t1 group by grp;
grp group_concat(distinct c limit 1,10 )
1 c
2 c
3 D,E
select grp,group_concat(c order by a) from t1 group by grp;
grp group_concat(c order by a)
1 b,c
2 c,b
3 E,C,D,E
select grp,group_concat(c order by a limit 2 ) from t1 group by grp;
grp group_concat(c order by a limit 2 )
1 b,c
2 c,b
3 E,C
select grp,group_concat(c order by a limit 1,1 ) from t1 group by grp;
grp group_concat(c order by a limit 1,1 )
1 c
2 b
3 C
select grp,group_concat(c order by c) from t1 group by grp;
grp group_concat(c order by c)
1 b,c
2 b,c
3 C,D,E,E
select grp,group_concat(c order by c limit 2) from t1 group by grp;
grp group_concat(c order by c limit 2)
1 b,c
2 b,c
3 C,D
select grp,group_concat(c order by c desc) from t1 group by grp;
grp group_concat(c order by c desc)
1 c,b
2 c,b
3 E,E,D,C
select grp,group_concat(c order by c desc limit 2) from t1 group by grp;
grp group_concat(c order by c desc limit 2)
1 c,b
2 c,b
3 E,E
#
# Empty results for group concat as offset is greater than the rows
# for a group
#
select grp,group_concat(distinct c limit 10,1 ) from t1 group by grp;
grp group_concat(distinct c limit 10,1 )
1
2
3
drop table t1;
create table t2 (a int, b varchar(10));
insert into t2 values(1,'a'),(1,'b'),(NULL,'c'),(2,'x'),(2,'y');
select group_concat(a,b limit 2) from t2;
group_concat(a,b limit 2)
1a,1b
set @x=4;
prepare STMT from 'select group_concat(b limit ?) from t2';
execute STMT using @x;
group_concat(b limit ?)
a,b,c,x
set @x=2;
execute STMT using @x;
group_concat(b limit ?)
a,b
set @x=1000;
execute STMT using @x;
group_concat(b limit ?)
a,b,c,x,y
set @x=0;
execute STMT using @x;
group_concat(b limit ?)
set @x="adasfa";
execute STMT using @x;
ERROR HY000: Limit only accepts integer values
set @x=-1;
execute STMT using @x;
ERROR HY000: Incorrect arguments to EXECUTE
set @x=4;
prepare STMT from 'select group_concat(a,b limit ?) from t2';
execute STMT using @x;
group_concat(a,b limit ?)
1a,1b,2x,2y
drop table t2;
#
# MDEV-18943: Group Concat with limit not working with views
#
create table t1 (a int, b varchar(10));
insert into t1 values(1,'a'),(1,'b'),(NULL,'c'),(2,'x'),(2,'y');
select group_concat(a,b limit 2) from t1;
group_concat(a,b limit 2)
1a,1b
create view v1 as select group_concat(a,b limit 2) from t1;
select * from v1;
group_concat(a,b limit 2)
1a,1b
drop view v1;
drop table t1;
#
# End of 10.3 tests
#
|