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
|
set global max_allowed_packet=400000000;
set storage_engine=aria;
affected rows: 0
drop table if exists t1, t2;
affected rows: 0
create table t1(a char(3));
affected rows: 0
insert into t1 values("abc");
affected rows: 1
insert into t1 select "def" from t1;
affected rows: 1
info: Records: 1 Duplicates: 0 Warnings: 0
insert into t1 select "ghi" from t1;
affected rows: 2
info: Records: 2 Duplicates: 0 Warnings: 0
insert into t1 select "jkl" from t1;
affected rows: 4
info: Records: 4 Duplicates: 0 Warnings: 0
insert into t1 select "mno" from t1;
affected rows: 8
info: Records: 8 Duplicates: 0 Warnings: 0
insert into t1 select "pqr" from t1;
affected rows: 16
info: Records: 16 Duplicates: 0 Warnings: 0
insert into t1 select "stu" from t1;
affected rows: 32
info: Records: 32 Duplicates: 0 Warnings: 0
insert into t1 select "vwx" from t1;
affected rows: 64
info: Records: 64 Duplicates: 0 Warnings: 0
insert into t1 select "yza" from t1;
affected rows: 128
info: Records: 128 Duplicates: 0 Warnings: 0
insert into t1 select "ceg" from t1;
affected rows: 256
info: Records: 256 Duplicates: 0 Warnings: 0
insert into t1 select "ikm" from t1;
affected rows: 512
info: Records: 512 Duplicates: 0 Warnings: 0
insert into t1 select "oqs" from t1;
affected rows: 1024
info: Records: 1024 Duplicates: 0 Warnings: 0
select count(*) from t1;
count(*)
2048
affected rows: 1
insert into t1 select "uwy" from t1;
affected rows: 2048
info: Records: 2048 Duplicates: 0 Warnings: 0
create table t2 select * from t1;
affected rows: 4096
info: Records: 4096 Duplicates: 0 Warnings: 0
select count(*) from t1;
count(*)
4096
affected rows: 1
select count(*) from t2;
count(*)
4096
affected rows: 1
drop table t1, t2;
affected rows: 0
create table t1 (a int, b longtext);
affected rows: 0
insert into t1 values (1,"123456789012345678901234567890"),(2,"09876543210987654321");
affected rows: 2
info: Records: 2 Duplicates: 0 Warnings: 0
update t1 set b=CONCAT(b,b);
affected rows: 2
info: Rows matched: 2 Changed: 2 Warnings: 0
update t1 set b=CONCAT(b,b);
affected rows: 2
info: Rows matched: 2 Changed: 2 Warnings: 0
update t1 set b=CONCAT(b,b);
affected rows: 2
info: Rows matched: 2 Changed: 2 Warnings: 0
update t1 set b=CONCAT(b,b);
affected rows: 2
info: Rows matched: 2 Changed: 2 Warnings: 0
update t1 set b=CONCAT(b,b);
affected rows: 2
info: Rows matched: 2 Changed: 2 Warnings: 0
update t1 set b=CONCAT(b,b);
affected rows: 2
info: Rows matched: 2 Changed: 2 Warnings: 0
update t1 set b=CONCAT(b,b);
affected rows: 2
info: Rows matched: 2 Changed: 2 Warnings: 0
update t1 set b=CONCAT(b,b);
affected rows: 2
info: Rows matched: 2 Changed: 2 Warnings: 0
update t1 set b=CONCAT(b,b);
affected rows: 2
info: Rows matched: 2 Changed: 2 Warnings: 0
update t1 set b=CONCAT(b,b);
affected rows: 2
info: Rows matched: 2 Changed: 2 Warnings: 0
update t1 set b=CONCAT(b,b);
affected rows: 2
info: Rows matched: 2 Changed: 2 Warnings: 0
update t1 set b=CONCAT(b,b);
affected rows: 2
info: Rows matched: 2 Changed: 2 Warnings: 0
update t1 set b=CONCAT(b,b);
affected rows: 2
info: Rows matched: 2 Changed: 2 Warnings: 0
update t1 set b=CONCAT(b,b);
affected rows: 2
info: Rows matched: 2 Changed: 2 Warnings: 0
update t1 set b=CONCAT(b,b);
affected rows: 2
info: Rows matched: 2 Changed: 2 Warnings: 0
update t1 set b=CONCAT(b,b);
affected rows: 2
info: Rows matched: 2 Changed: 2 Warnings: 0
update t1 set b=CONCAT(b,b);
affected rows: 2
info: Rows matched: 2 Changed: 2 Warnings: 0
update t1 set b=CONCAT(b,b);
affected rows: 2
info: Rows matched: 2 Changed: 2 Warnings: 0
update t1 set b=CONCAT(b,b);
affected rows: 2
info: Rows matched: 2 Changed: 2 Warnings: 0
update t1 set b=CONCAT(b,b);
affected rows: 2
info: Rows matched: 2 Changed: 2 Warnings: 0
update t1 set b=CONCAT(b,b);
affected rows: 2
info: Rows matched: 2 Changed: 2 Warnings: 0
update t1 set b=CONCAT(b,b);
affected rows: 2
info: Rows matched: 2 Changed: 2 Warnings: 0
update t1 set b=CONCAT(b,b);
affected rows: 2
info: Rows matched: 2 Changed: 2 Warnings: 0
select a,length(b) from t1;
a length(b)
1 251658240
2 167772160
affected rows: 2
check table t1;
Table Op Msg_type Msg_text
test.t1 check status OK
affected rows: 1
update t1 set b=mid(b,1,length(b)/2);
affected rows: 2
info: Rows matched: 2 Changed: 2 Warnings: 0
update t1 set b=mid(b,1,length(b)/2);
affected rows: 2
info: Rows matched: 2 Changed: 2 Warnings: 0
update t1 set b=mid(b,1,length(b)/2);
affected rows: 2
info: Rows matched: 2 Changed: 2 Warnings: 0
update t1 set b=mid(b,1,length(b)/2);
affected rows: 2
info: Rows matched: 2 Changed: 2 Warnings: 0
update t1 set b=mid(b,1,length(b)/2);
affected rows: 2
info: Rows matched: 2 Changed: 2 Warnings: 0
update t1 set b=mid(b,1,length(b)/2);
affected rows: 2
info: Rows matched: 2 Changed: 2 Warnings: 0
update t1 set b=mid(b,1,length(b)/2);
affected rows: 2
info: Rows matched: 2 Changed: 2 Warnings: 0
update t1 set b=mid(b,1,length(b)/2);
affected rows: 2
info: Rows matched: 2 Changed: 2 Warnings: 0
update t1 set b=mid(b,1,length(b)/2);
affected rows: 2
info: Rows matched: 2 Changed: 2 Warnings: 0
update t1 set b=mid(b,1,length(b)/2);
affected rows: 2
info: Rows matched: 2 Changed: 2 Warnings: 0
update t1 set b=mid(b,1,length(b)/2);
affected rows: 2
info: Rows matched: 2 Changed: 2 Warnings: 0
update t1 set b=mid(b,1,length(b)/2);
affected rows: 2
info: Rows matched: 2 Changed: 2 Warnings: 0
update t1 set b=mid(b,1,length(b)/2);
affected rows: 2
info: Rows matched: 2 Changed: 2 Warnings: 0
update t1 set b=mid(b,1,length(b)/2);
affected rows: 2
info: Rows matched: 2 Changed: 2 Warnings: 0
update t1 set b=mid(b,1,length(b)/2);
affected rows: 2
info: Rows matched: 2 Changed: 2 Warnings: 0
update t1 set b=mid(b,1,length(b)/2);
affected rows: 2
info: Rows matched: 2 Changed: 2 Warnings: 0
update t1 set b=mid(b,1,length(b)/2);
affected rows: 2
info: Rows matched: 2 Changed: 2 Warnings: 0
update t1 set b=mid(b,1,length(b)/2);
affected rows: 2
info: Rows matched: 2 Changed: 2 Warnings: 0
update t1 set b=mid(b,1,length(b)/2);
affected rows: 2
info: Rows matched: 2 Changed: 2 Warnings: 0
update t1 set b=mid(b,1,length(b)/2);
affected rows: 2
info: Rows matched: 2 Changed: 2 Warnings: 0
update t1 set b=mid(b,1,length(b)/2);
affected rows: 2
info: Rows matched: 2 Changed: 2 Warnings: 0
update t1 set b=mid(b,1,length(b)/2);
affected rows: 2
info: Rows matched: 2 Changed: 2 Warnings: 0
select a,length(b) from t1;
a length(b)
1 60
2 40
affected rows: 2
check table t1;
Table Op Msg_type Msg_text
test.t1 check status OK
affected rows: 1
drop table t1;
affected rows: 0
|
