drop table if exists t1;
SET @test_character_set= 'gbk';
SET @test_collation= 'gbk_chinese_ci';
SET @safe_character_set_server= @@character_set_server;
SET @safe_collation_server= @@collation_server;
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)	gbk_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)	gbk_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;
DROP DATABASE d1;
USE test;
SET character_set_server= @safe_character_set_server;
SET collation_server= @safe_collation_server;
SET NAMES gbk;
SET collation_connection='gbk_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)
gbk_chinese_ci	6109
gbk_chinese_ci	61
gbk_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)
gbk_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
gbk_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;
SET collation_connection='gbk_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)
gbk_bin	6109
gbk_bin	61
gbk_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)
gbk_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
gbk_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;
SET NAMES gbk;
CREATE TABLE t1 (a text) character set gbk;
INSERT INTO t1 VALUES (0xA3A0),(0xA1A1);
SELECT hex(a) FROM t1 ORDER BY a;
hex(a)
A1A1
A3A0
DROP TABLE t1;
select hex(convert(_gbk 0xA14041 using ucs2));
hex(convert(_gbk 0xA14041 using ucs2))
003F0041
