drop table if exists t1;
SET @test_character_set= 'gb2312';
SET @test_collation= 'gb2312_chinese_ci';
SET @safe_character_set_server= @@character_set_server;
SET @safe_collation_server= @@collation_server;
SET @safe_character_set_client= @@character_set_client;
SET @safe_character_set_results= @@character_set_results;
SET character_set_server= @test_character_set;
SET collation_server= @test_collation;
CREATE DATABASE d1;
USE d1;
CREATE TABLE t1 (c CHAR(10), KEY(c));
SHOW FULL COLUMNS FROM t1;
Field	Type	Collation	Null	Key	Default	Extra	Privileges	Comment
c	char(10)	gb2312_chinese_ci	YES	MUL	NULL			
INSERT INTO t1 VALUES ('aaa'),('aaaa'),('aaaaa');
SELECT c as want3results FROM t1 WHERE c LIKE 'aaa%';
want3results
aaa
aaaa
aaaaa
DROP TABLE t1;
CREATE TABLE t1 (c1 varchar(15), KEY c1 (c1(2)));
SHOW FULL COLUMNS FROM t1;
Field	Type	Collation	Null	Key	Default	Extra	Privileges	Comment
c1	varchar(15)	gb2312_chinese_ci	YES	MUL	NULL			
INSERT INTO t1 VALUES ('location'),('loberge'),('lotre'),('boabab');
SELECT c1 as want3results from t1 where c1 like 'l%';
want3results
location
loberge
lotre
SELECT c1 as want3results from t1 where c1 like 'lo%';
want3results
location
loberge
lotre
SELECT c1 as want1result  from t1 where c1 like 'loc%';
want1result
location
SELECT c1 as want1result  from t1 where c1 like 'loca%';
want1result
location
SELECT c1 as want1result  from t1 where c1 like 'locat%';
want1result
location
SELECT c1 as want1result  from t1 where c1 like 'locati%';
want1result
location
SELECT c1 as want1result  from t1 where c1 like 'locatio%';
want1result
location
SELECT c1 as want1result  from t1 where c1 like 'location%';
want1result
location
DROP TABLE t1;
create table t1 (a set('a') not null);
insert into t1 values (),();
Warnings:
Warning	1364	Field 'a' doesn't have a default value
select cast(a as char(1)) from t1;
cast(a as char(1))


select a sounds like a from t1;
a sounds like a
1
1
select 1 from t1 order by cast(a as char(1));
1
1
1
drop table t1;
set names utf8;
create table t1 (
name varchar(10),
level smallint unsigned);
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `name` varchar(10) DEFAULT NULL,
  `level` smallint(5) unsigned DEFAULT NULL
) ENGINE=MyISAM DEFAULT CHARSET=gb2312
insert into t1 values ('string',1);
select concat(name,space(level)), concat(name, repeat(' ',level)) from t1;
concat(name,space(level))	concat(name, repeat(' ',level))
string 	string 
drop table t1;
DROP DATABASE d1;
USE test;
SET character_set_server= @safe_character_set_server;
SET collation_server= @safe_collation_server;
SET character_set_client= @safe_character_set_client;
SET character_set_results= @safe_character_set_results;
SET NAMES gb2312;
SET collation_connection='gb2312_chinese_ci';
create table t1 select repeat('a',4000) a;
delete from t1;
insert into t1 values ('a'), ('a '), ('a\t');
select collation(a),hex(a) from t1 order by a;
collation(a)	hex(a)
gb2312_chinese_ci	6109
gb2312_chinese_ci	61
gb2312_chinese_ci	6120
drop table t1;
create table t1 engine=innodb select repeat('a',50) as c1;
alter table t1 add index(c1(5));
insert into t1 values ('abcdefg'),('abcde100'),('abcde110'),('abcde111');
select collation(c1) from t1 limit 1;
collation(c1)
gb2312_chinese_ci
select c1 from t1 where c1 like 'abcdef%' order by c1;
c1
abcdefg
select c1 from t1 where c1 like 'abcde1%' order by c1;
c1
abcde100
abcde110
abcde111
select c1 from t1 where c1 like 'abcde11%' order by c1;
c1
abcde110
abcde111
select c1 from t1 where c1 like 'abcde111%' order by c1;
c1
abcde111
drop table t1;
select @@collation_connection;
@@collation_connection
gb2312_chinese_ci
create table t1 ROW_FORMAT=DYNAMIC select repeat('a',50) as c1 ;
insert into t1 values('abcdef');
insert into t1 values('_bcdef');
insert into t1 values('a_cdef');
insert into t1 values('ab_def');
insert into t1 values('abc_ef');
insert into t1 values('abcd_f');
insert into t1 values('abcde_');
select c1 as c1u from t1 where c1 like 'ab\_def';
c1u
ab_def
select c1 as c2h from t1 where c1 like 'ab#_def' escape '#';
c2h
ab_def
drop table t1;
CREATE TABLE t1 AS
SELECT 10 AS a, REPEAT('a',20) AS b, REPEAT('a',8) AS c, REPEAT('a',8) AS d;
ALTER TABLE t1 ADD PRIMARY KEY(a), ADD KEY(b);
INSERT INTO t1 (a, b) VALUES (1, repeat(0xF1F2,5));
INSERT INTO t1 (a, b) VALUES (2, repeat(0xF1F2,10));
INSERT INTO t1 (a, b) VALUES (3, repeat(0xF1F2,11));
INSERT INTO t1 (a, b) VALUES (4, repeat(0xF1F2,12));
SELECT hex(concat(repeat(0xF1F2, 10), '%'));
hex(concat(repeat(0xF1F2, 10), '%'))
F1F2F1F2F1F2F1F2F1F2F1F2F1F2F1F2F1F2F1F225
3 rows expected
SELECT a, hex(b), c FROM t1 WHERE b LIKE concat(repeat(0xF1F2,10), '%');
a	hex(b)	c
2	F1F2F1F2F1F2F1F2F1F2F1F2F1F2F1F2F1F2F1F2	
3	F1F2F1F2F1F2F1F2F1F2F1F2F1F2F1F2F1F2F1F2F1F2	
4	F1F2F1F2F1F2F1F2F1F2F1F2F1F2F1F2F1F2F1F2F1F2F1F2	
DROP TABLE t1;
SET collation_connection='gb2312_bin';
create table t1 select repeat('a',4000) a;
delete from t1;
insert into t1 values ('a'), ('a '), ('a\t');
select collation(a),hex(a) from t1 order by a;
collation(a)	hex(a)
gb2312_bin	6109
gb2312_bin	61
gb2312_bin	6120
drop table t1;
create table t1 engine=innodb select repeat('a',50) as c1;
alter table t1 add index(c1(5));
insert into t1 values ('abcdefg'),('abcde100'),('abcde110'),('abcde111');
select collation(c1) from t1 limit 1;
collation(c1)
gb2312_bin
select c1 from t1 where c1 like 'abcdef%' order by c1;
c1
abcdefg
select c1 from t1 where c1 like 'abcde1%' order by c1;
c1
abcde100
abcde110
abcde111
select c1 from t1 where c1 like 'abcde11%' order by c1;
c1
abcde110
abcde111
select c1 from t1 where c1 like 'abcde111%' order by c1;
c1
abcde111
drop table t1;
select @@collation_connection;
@@collation_connection
gb2312_bin
create table t1 ROW_FORMAT=DYNAMIC select repeat('a',50) as c1 ;
insert into t1 values('abcdef');
insert into t1 values('_bcdef');
insert into t1 values('a_cdef');
insert into t1 values('ab_def');
insert into t1 values('abc_ef');
insert into t1 values('abcd_f');
insert into t1 values('abcde_');
select c1 as c1u from t1 where c1 like 'ab\_def';
c1u
ab_def
select c1 as c2h from t1 where c1 like 'ab#_def' escape '#';
c2h
ab_def
drop table t1;
CREATE TABLE t1 AS
SELECT 10 AS a, REPEAT('a',20) AS b, REPEAT('a',8) AS c, REPEAT('a',8) AS d;
ALTER TABLE t1 ADD PRIMARY KEY(a), ADD KEY(b);
INSERT INTO t1 (a, b) VALUES (1, repeat(0xF1F2,5));
INSERT INTO t1 (a, b) VALUES (2, repeat(0xF1F2,10));
INSERT INTO t1 (a, b) VALUES (3, repeat(0xF1F2,11));
INSERT INTO t1 (a, b) VALUES (4, repeat(0xF1F2,12));
SELECT hex(concat(repeat(0xF1F2, 10), '%'));
hex(concat(repeat(0xF1F2, 10), '%'))
F1F2F1F2F1F2F1F2F1F2F1F2F1F2F1F2F1F2F1F225
3 rows expected
SELECT a, hex(b), c FROM t1 WHERE b LIKE concat(repeat(0xF1F2,10), '%');
a	hex(b)	c
2	F1F2F1F2F1F2F1F2F1F2F1F2F1F2F1F2F1F2F1F2	
3	F1F2F1F2F1F2F1F2F1F2F1F2F1F2F1F2F1F2F1F2F1F2	
4	F1F2F1F2F1F2F1F2F1F2F1F2F1F2F1F2F1F2F1F2F1F2F1F2	
DROP TABLE t1;
SET NAMES gb2312;
CREATE TABLE t1 (a text) character set gb2312;
INSERT INTO t1 VALUES (0xA2A1),(0xD7FE);
SELECT hex(a) FROM t1 ORDER BY a;
hex(a)
A2A1
D7FE
DROP TABLE t1;