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drop table if exists t1, t2;
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 Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 9 Using filesort
Warnings:
Note 1003 select test.t1.grp AS `grp`,group_concat(test.t1.c seperator ',') 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(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(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 Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 9 Using filesort
Warnings:
Note 1003 select test.t1.grp AS `grp`,group_concat(distinct test.t1.c order by test.t1.c seperator ',') 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 Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 9 Using filesort
Warnings:
Note 1003 select test.t1.grp AS `grp`,group_concat(distinct test.t1.c order by test.t1.c seperator ',') 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 1 line(s) were cut by GROUP_CONCAT()
show warnings;
Level Code Message
Warning 1260 1 line(s) were cut by GROUP_CONCAT()
set group_concat_max_len = 1024;
select group_concat(sum(a)) 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 'group statement'
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,c
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 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;
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