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|
drop table if exists t1, t2;
create table t1 (v varchar(30), c char(3), e enum('abc','def','ghi'), t text);
show create table t1;
Table Create Table
t1 CREATE TABLE `t1` (
`v` varchar(30) DEFAULT NULL,
`c` char(3) DEFAULT NULL,
`e` enum('abc','def','ghi') DEFAULT NULL,
`t` text
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
insert into t1 values ('abc', 'de', 'ghi', 'jkl');
insert into t1 values ('abc ', 'de ', 'ghi', 'jkl ');
insert into t1 values ('abc ', 'd ', 'ghi', 'jkl ');
select length(v),length(c),length(e),length(t) from t1;
length(v) length(c) length(e) length(t)
3 2 3 3
4 2 3 4
7 1 3 7
drop table t1;
create table t1 (v varchar(20)) charset latin1;
insert into t1 values('a ');
select v='a' from t1;
v='a'
1
select binary v='a' from t1;
binary v='a'
0
Warnings:
Warning 1287 'BINARY expr' is deprecated and will be removed in a future release. Please use CAST instead
select binary v='a ' from t1;
binary v='a '
1
Warnings:
Warning 1287 'BINARY expr' is deprecated and will be removed in a future release. Please use CAST instead
insert into t1 values('a');
alter table t1 add primary key (v);
ERROR 23000: Duplicate entry 'a ' for key 't1.PRIMARY'
drop table t1;
create table t1 (v varbinary(20));
insert into t1 values('a');
insert into t1 values('a ');
alter table t1 add primary key (v);
drop table t1;
create table t1 (v varchar(254), index (v)) charset latin1;
insert into t1 values ("This is a test ");
insert into t1 values ("Some sample data");
insert into t1 values (" garbage ");
insert into t1 values (" This is a test ");
insert into t1 values ("This is a test");
insert into t1 values ("Hello world");
insert into t1 values ("Foo bar");
insert into t1 values ("This is a test");
insert into t1 values ("MySQL varchar test");
insert into t1 values ("test MySQL varchar");
insert into t1 values ("This is a long string to have some random length data included");
insert into t1 values ("Short string");
insert into t1 values ("VSS");
insert into t1 values ("Some samples");
insert into t1 values ("Bar foo");
insert into t1 values ("Bye");
ANALYZE TABLE t1;
Table Op Msg_type Msg_text
test.t1 analyze status OK
select * from t1 where v like 'This is a test' order by v;
v
This is a test
This is a test
select * from t1 where v='This is a test' order by v;
v
This is a test
This is a test
This is a test
select * from t1 where v like 'S%' order by v;
v
Short string
Some sample data
Some samples
explain select * from t1 where v like 'This is a test' order by v;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL range v v 257 NULL 3 100.00 Using where; Using index
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`v` AS `v` from `test`.`t1` where (`test`.`t1`.`v` like 'This is a test') order by `test`.`t1`.`v`
Helper line 1 for --skip_if_hypergraph diffing
explain select * from t1 where v='This is a test' order by v;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL ref v v 257 const 3 100.00 Using index
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`v` AS `v` from `test`.`t1` where (`test`.`t1`.`v` = 'This is a test') order by `test`.`t1`.`v`
Helper line 2 for --skip_if_hypergraph diffing
explain select * from t1 where v like 'S%' order by v;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL range v v 257 NULL 3 100.00 Using where; Using index
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`v` AS `v` from `test`.`t1` where (`test`.`t1`.`v` like 'S%') order by `test`.`t1`.`v`
alter table t1 change v v varchar(255);
ANALYZE TABLE t1;
Table Op Msg_type Msg_text
test.t1 analyze status OK
select * from t1 where v like 'This is a test' order by v;
v
This is a test
This is a test
select * from t1 where v='This is a test' order by v;
v
This is a test
This is a test
This is a test
select * from t1 where v like 'S%' order by v;
v
Short string
Some sample data
Some samples
explain select * from t1 where v like 'This is a test' order by v;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL range v v 258 NULL 3 100.00 Using where; Using index
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`v` AS `v` from `test`.`t1` where (`test`.`t1`.`v` like 'This is a test') order by `test`.`t1`.`v`
Helper line 1 for --skip_if_hypergraph diffing
explain select * from t1 where v='This is a test' order by v;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL ref v v 258 const 3 100.00 Using index
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`v` AS `v` from `test`.`t1` where (`test`.`t1`.`v` = 'This is a test') order by `test`.`t1`.`v`
Helper line 2 for --skip_if_hypergraph diffing
explain select * from t1 where v like 'S%' order by v;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL range v v 258 NULL 3 100.00 Using where; Using index
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`v` AS `v` from `test`.`t1` where (`test`.`t1`.`v` like 'S%') order by `test`.`t1`.`v`
alter table t1 change v v varchar(256);
ANALYZE TABLE t1;
Table Op Msg_type Msg_text
test.t1 analyze status OK
select * from t1 where v like 'This is a test' order by v;
v
This is a test
This is a test
select * from t1 where v='This is a test' order by v;
v
This is a test
This is a test
This is a test
select * from t1 where v like 'S%' order by v;
v
Short string
Some sample data
Some samples
explain select * from t1 where v like 'This is a test' order by v;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL range v v 259 NULL 3 100.00 Using where; Using index
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`v` AS `v` from `test`.`t1` where (`test`.`t1`.`v` like 'This is a test') order by `test`.`t1`.`v`
Helper line 1 for --skip_if_hypergraph diffing
explain select * from t1 where v='This is a test' order by v;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL ref v v 259 const 3 100.00 Using index
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`v` AS `v` from `test`.`t1` where (`test`.`t1`.`v` = 'This is a test') order by `test`.`t1`.`v`
Helper line 2 for --skip_if_hypergraph diffing
explain select * from t1 where v like 'S%' order by v;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL range v v 259 NULL 3 100.00 Using where; Using index
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`v` AS `v` from `test`.`t1` where (`test`.`t1`.`v` like 'S%') order by `test`.`t1`.`v`
alter table t1 change v v varchar(257);
ANALYZE TABLE t1;
Table Op Msg_type Msg_text
test.t1 analyze status OK
select * from t1 where v like 'This is a test' order by v;
v
This is a test
This is a test
select * from t1 where v='This is a test' order by v;
v
This is a test
This is a test
This is a test
select * from t1 where v like 'S%' order by v;
v
Short string
Some sample data
Some samples
explain select * from t1 where v like 'This is a test' order by v;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL range v v 260 NULL 3 100.00 Using where; Using index
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`v` AS `v` from `test`.`t1` where (`test`.`t1`.`v` like 'This is a test') order by `test`.`t1`.`v`
Helper line 1 for --skip_if_hypergraph diffing
explain select * from t1 where v='This is a test' order by v;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL ref v v 260 const 3 100.00 Using index
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`v` AS `v` from `test`.`t1` where (`test`.`t1`.`v` = 'This is a test') order by `test`.`t1`.`v`
Helper line 2 for --skip_if_hypergraph diffing
explain select * from t1 where v like 'S%' order by v;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL range v v 260 NULL 3 100.00 Using where; Using index
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`v` AS `v` from `test`.`t1` where (`test`.`t1`.`v` like 'S%') order by `test`.`t1`.`v`
alter table t1 change v v varchar(258);
ANALYZE TABLE t1;
Table Op Msg_type Msg_text
test.t1 analyze status OK
select * from t1 where v like 'This is a test' order by v;
v
This is a test
This is a test
select * from t1 where v='This is a test' order by v;
v
This is a test
This is a test
This is a test
select * from t1 where v like 'S%' order by v;
v
Short string
Some sample data
Some samples
explain select * from t1 where v like 'This is a test' order by v;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL range v v 261 NULL 3 100.00 Using where; Using index
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`v` AS `v` from `test`.`t1` where (`test`.`t1`.`v` like 'This is a test') order by `test`.`t1`.`v`
Helper line 1 for --skip_if_hypergraph diffing
explain select * from t1 where v='This is a test' order by v;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL ref v v 261 const 3 100.00 Using index
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`v` AS `v` from `test`.`t1` where (`test`.`t1`.`v` = 'This is a test') order by `test`.`t1`.`v`
Helper line 2 for --skip_if_hypergraph diffing
explain select * from t1 where v like 'S%' order by v;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL range v v 261 NULL 3 100.00 Using where; Using index
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`v` AS `v` from `test`.`t1` where (`test`.`t1`.`v` like 'S%') order by `test`.`t1`.`v`
alter table t1 change v v varchar(259);
ANALYZE TABLE t1;
Table Op Msg_type Msg_text
test.t1 analyze status OK
select * from t1 where v like 'This is a test' order by v;
v
This is a test
This is a test
select * from t1 where v='This is a test' order by v;
v
This is a test
This is a test
This is a test
select * from t1 where v like 'S%' order by v;
v
Short string
Some sample data
Some samples
explain select * from t1 where v like 'This is a test' order by v;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL range v v 262 NULL 3 100.00 Using where; Using index
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`v` AS `v` from `test`.`t1` where (`test`.`t1`.`v` like 'This is a test') order by `test`.`t1`.`v`
Helper line 3 for --skip_if_hypergraph diffing
explain select * from t1 where v='This is a test' order by v;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL ref v v 262 const 3 100.00 Using index
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`v` AS `v` from `test`.`t1` where (`test`.`t1`.`v` = 'This is a test') order by `test`.`t1`.`v`
Helper line 4 for --skip_if_hypergraph diffing
explain select * from t1 where v like 'S%' order by v;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL range v v 262 NULL 3 100.00 Using where; Using index
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`v` AS `v` from `test`.`t1` where (`test`.`t1`.`v` like 'S%') order by `test`.`t1`.`v`
alter table t1 change v v varchar(258);
ANALYZE TABLE t1;
Table Op Msg_type Msg_text
test.t1 analyze status OK
select * from t1 where v like 'This is a test' order by v;
v
This is a test
This is a test
select * from t1 where v='This is a test' order by v;
v
This is a test
This is a test
This is a test
select * from t1 where v like 'S%' order by v;
v
Short string
Some sample data
Some samples
explain select * from t1 where v like 'This is a test' order by v;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL range v v 261 NULL 3 100.00 Using where; Using index
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`v` AS `v` from `test`.`t1` where (`test`.`t1`.`v` like 'This is a test') order by `test`.`t1`.`v`
Helper line 3 for --skip_if_hypergraph diffing
explain select * from t1 where v='This is a test' order by v;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL ref v v 261 const 3 100.00 Using index
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`v` AS `v` from `test`.`t1` where (`test`.`t1`.`v` = 'This is a test') order by `test`.`t1`.`v`
Helper line 4 for --skip_if_hypergraph diffing
explain select * from t1 where v like 'S%' order by v;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL range v v 261 NULL 3 100.00 Using where; Using index
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`v` AS `v` from `test`.`t1` where (`test`.`t1`.`v` like 'S%') order by `test`.`t1`.`v`
alter table t1 change v v varchar(257);
ANALYZE TABLE t1;
Table Op Msg_type Msg_text
test.t1 analyze status OK
select * from t1 where v like 'This is a test' order by v;
v
This is a test
This is a test
select * from t1 where v='This is a test' order by v;
v
This is a test
This is a test
This is a test
select * from t1 where v like 'S%' order by v;
v
Short string
Some sample data
Some samples
explain select * from t1 where v like 'This is a test' order by v;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL range v v 260 NULL 3 100.00 Using where; Using index
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`v` AS `v` from `test`.`t1` where (`test`.`t1`.`v` like 'This is a test') order by `test`.`t1`.`v`
Helper line 3 for --skip_if_hypergraph diffing
explain select * from t1 where v='This is a test' order by v;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL ref v v 260 const 3 100.00 Using index
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`v` AS `v` from `test`.`t1` where (`test`.`t1`.`v` = 'This is a test') order by `test`.`t1`.`v`
Helper line 4 for --skip_if_hypergraph diffing
explain select * from t1 where v like 'S%' order by v;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL range v v 260 NULL 3 100.00 Using where; Using index
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`v` AS `v` from `test`.`t1` where (`test`.`t1`.`v` like 'S%') order by `test`.`t1`.`v`
alter table t1 change v v varchar(256);
ANALYZE TABLE t1;
Table Op Msg_type Msg_text
test.t1 analyze status OK
select * from t1 where v like 'This is a test' order by v;
v
This is a test
This is a test
select * from t1 where v='This is a test' order by v;
v
This is a test
This is a test
This is a test
select * from t1 where v like 'S%' order by v;
v
Short string
Some sample data
Some samples
explain select * from t1 where v like 'This is a test' order by v;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL range v v 259 NULL 3 100.00 Using where; Using index
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`v` AS `v` from `test`.`t1` where (`test`.`t1`.`v` like 'This is a test') order by `test`.`t1`.`v`
Helper line 3 for --skip_if_hypergraph diffing
explain select * from t1 where v='This is a test' order by v;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL ref v v 259 const 3 100.00 Using index
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`v` AS `v` from `test`.`t1` where (`test`.`t1`.`v` = 'This is a test') order by `test`.`t1`.`v`
Helper line 4 for --skip_if_hypergraph diffing
explain select * from t1 where v like 'S%' order by v;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL range v v 259 NULL 3 100.00 Using where; Using index
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`v` AS `v` from `test`.`t1` where (`test`.`t1`.`v` like 'S%') order by `test`.`t1`.`v`
alter table t1 change v v varchar(255);
ANALYZE TABLE t1;
Table Op Msg_type Msg_text
test.t1 analyze status OK
select * from t1 where v like 'This is a test' order by v;
v
This is a test
This is a test
select * from t1 where v='This is a test' order by v;
v
This is a test
This is a test
This is a test
select * from t1 where v like 'S%' order by v;
v
Short string
Some sample data
Some samples
explain select * from t1 where v like 'This is a test' order by v;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL range v v 258 NULL 3 100.00 Using where; Using index
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`v` AS `v` from `test`.`t1` where (`test`.`t1`.`v` like 'This is a test') order by `test`.`t1`.`v`
Helper line 3 for --skip_if_hypergraph diffing
explain select * from t1 where v='This is a test' order by v;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL ref v v 258 const 3 100.00 Using index
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`v` AS `v` from `test`.`t1` where (`test`.`t1`.`v` = 'This is a test') order by `test`.`t1`.`v`
Helper line 4 for --skip_if_hypergraph diffing
explain select * from t1 where v like 'S%' order by v;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL range v v 258 NULL 3 100.00 Using where; Using index
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`v` AS `v` from `test`.`t1` where (`test`.`t1`.`v` like 'S%') order by `test`.`t1`.`v`
alter table t1 change v v varchar(254);
ANALYZE TABLE t1;
Table Op Msg_type Msg_text
test.t1 analyze status OK
select * from t1 where v like 'This is a test' order by v;
v
This is a test
This is a test
select * from t1 where v='This is a test' order by v;
v
This is a test
This is a test
This is a test
select * from t1 where v like 'S%' order by v;
v
Short string
Some sample data
Some samples
explain select * from t1 where v like 'This is a test' order by v;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL range v v 257 NULL 3 100.00 Using where; Using index
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`v` AS `v` from `test`.`t1` where (`test`.`t1`.`v` like 'This is a test') order by `test`.`t1`.`v`
Helper line 3 for --skip_if_hypergraph diffing
explain select * from t1 where v='This is a test' order by v;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL ref v v 257 const 3 100.00 Using index
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`v` AS `v` from `test`.`t1` where (`test`.`t1`.`v` = 'This is a test') order by `test`.`t1`.`v`
Helper line 4 for --skip_if_hypergraph diffing
explain select * from t1 where v like 'S%' order by v;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL range v v 257 NULL 3 100.00 Using where; Using index
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`v` AS `v` from `test`.`t1` where (`test`.`t1`.`v` like 'S%') order by `test`.`t1`.`v`
alter table t1 change v v varchar(253);
alter table t1 change v v varchar(254), drop key v;
alter table t1 change v v varchar(300), add key (v(10));
select * from t1 where v like 'This is a test' order by v;
v
This is a test
This is a test
select * from t1 where v='This is a test' order by v;
v
This is a test
This is a test
This is a test
select * from t1 where v like 'S%' order by v;
v
Short string
Some sample data
Some samples
explain select * from t1 where v like 'This is a test' order by v;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL range v v 13 NULL 4 100.00 Using where; Using filesort
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`v` AS `v` from `test`.`t1` where (`test`.`t1`.`v` like 'This is a test') order by `test`.`t1`.`v`
Helper line 5 for --skip_if_hypergraph diffing
explain select * from t1 where v='This is a test' order by v;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL ref v v 13 const 4 100.00 Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`v` AS `v` from `test`.`t1` where (`test`.`t1`.`v` = 'This is a test') order by `test`.`t1`.`v`
Helper line 6 for --skip_if_hypergraph diffing
explain select * from t1 where v like 'S%' order by v;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL range v v 13 NULL 3 100.00 Using where; Using filesort
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`v` AS `v` from `test`.`t1` where (`test`.`t1`.`v` like 'S%') order by `test`.`t1`.`v`
drop table t1;
create table t1 (pkcol varchar(16), othercol varchar(16), primary key (pkcol));
insert into t1 values ('test', 'something');
update t1 set othercol='somethingelse' where pkcol='test';
select * from t1;
pkcol othercol
test somethingelse
drop table t1;
create table t1 (a int, b varchar(12));
insert into t1 values (1, 'A'), (22, NULL);
create table t2 (a int);
insert into t2 values (22), (22);
select t1.a, t1.b, min(t1.b) from t1 inner join t2 ON t2.a = t1.a
group by t1.b, t1.a;
a b min(t1.b)
22 NULL NULL
drop table t1, t2;
create table t1 (f1 varchar(65500)) charset latin1;
create index index1 on t1(f1(10));
show create table t1;
Table Create Table
t1 CREATE TABLE `t1` (
`f1` varchar(65500) DEFAULT NULL,
KEY `index1` (`f1`(10))
) ENGINE=InnoDB DEFAULT CHARSET=latin1
alter table t1 modify f1 varchar(255);
show create table t1;
Table Create Table
t1 CREATE TABLE `t1` (
`f1` varchar(255) DEFAULT NULL,
KEY `index1` (`f1`(10))
) ENGINE=InnoDB DEFAULT CHARSET=latin1
alter table t1 modify f1 tinytext;
show create table t1;
Table Create Table
t1 CREATE TABLE `t1` (
`f1` tinytext,
KEY `index1` (`f1`(10))
) ENGINE=InnoDB DEFAULT CHARSET=latin1
drop table t1;
DROP TABLE IF EXISTS t1;
CREATE TABLE t1(f1 VARCHAR(100) DEFAULT 'test');
INSERT INTO t1 VALUES(SUBSTR(f1, 1, 3));
DROP TABLE IF EXISTS t1;
CREATE TABLE t1(f1 CHAR(100) DEFAULT 'test');
INSERT INTO t1 VALUES(SUBSTR(f1, 1, 3));
DROP TABLE IF EXISTS t1;
CREATE TABLE t1 (a CHAR(2));
INSERT INTO t1 VALUES (10), (50), (30), ('1a'), (60), ('t');
SELECT a,(a + 0) FROM t1 ORDER BY a;
a (a + 0)
10 10
1a 1
30 30
50 50
60 60
t 0
Warnings:
Warning 1292 Truncated incorrect DOUBLE value: '1a'
Warning 1292 Truncated incorrect DOUBLE value: 't'
SELECT a,(a DIV 2) FROM t1 ORDER BY a;
a (a DIV 2)
10 5
1a 0
30 15
50 25
60 30
t 0
Warnings:
Warning 1292 Truncated incorrect DECIMAL value: '1a'
Warning 1366 Incorrect DECIMAL value: '0' for column '' at row -1
Warning 1292 Truncated incorrect DECIMAL value: 't'
SELECT a,CAST(a AS SIGNED) FROM t1 ORDER BY a;
a CAST(a AS SIGNED)
10 10
1a 1
30 30
50 50
60 60
t 0
Warnings:
Warning 1292 Truncated incorrect INTEGER value: '1a'
Warning 1292 Truncated incorrect INTEGER value: 't'
DROP TABLE t1;
CREATE TABLE t1 (a VARCHAR(16));
INSERT INTO t1 VALUES ('5'), ('s'), ('');
SELECT 5 = a FROM t1;
5 = a
1
0
0
Warnings:
Warning 1292 Truncated incorrect DOUBLE value: 's'
DROP TABLE t1;
CREATE TABLE t1 (a CHAR(16));
INSERT INTO t1 VALUES ('5'), ('s'), ('');
SELECT 5 = a FROM t1;
5 = a
1
0
0
Warnings:
Warning 1292 Truncated incorrect DOUBLE value: 's'
DROP TABLE t1;
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