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
|
drop table if exists t1,t2;
create table t1 (name char(20) not null, primary key (name));
create table t2 (name char(20) binary not null, primary key (name));
insert into t1 values ("å");
insert into t1 values ("ä");
insert into t1 values ("ö");
insert into t2 select * from t1;
select * from t1 order by name;
name
å
ä
ö
select concat("*",name,"*") from t1 order by 1;
concat("*",name,"*")
*å*
*ä*
*ö*
select min(name),min(concat("*",name,"*")),max(name),max(concat("*",name,"*")) from t1;
min(name) min(concat("*",name,"*")) max(name) max(concat("*",name,"*"))
å *å* ö *ö*
select * from t2 order by name;
name
ä
å
ö
select concat("*",name,"*") from t2 order by 1;
concat("*",name,"*")
*ä*
*å*
*ö*
select min(name),min(concat("*",name,"*")),max(name),max(concat("*",name,"*")) from t2;
min(name) min(concat("*",name,"*")) max(name) max(concat("*",name,"*"))
ä *ä* ö *ö*
select name from t1 where name between 'Ä' and 'Ö';
name
ä
ö
select name from t2 where name between 'ä' and 'ö';
name
ä
å
ö
select name from t2 where name between 'Ä' and 'Ö';
name
drop table t1,t2;
create table t1 (a char(10) not null, b char(10) binary not null,key (a), key(b));
insert into t1 values ("hello ","hello "),("hello2 ","hello2 ");
select concat("-",a,"-",b,"-") from t1 where a="hello";
concat("-",a,"-",b,"-")
-hello-hello-
select concat("-",a,"-",b,"-") from t1 where a="hello ";
concat("-",a,"-",b,"-")
-hello-hello-
select concat("-",a,"-",b,"-") from t1 ignore index (a) where a="hello ";
concat("-",a,"-",b,"-")
-hello-hello-
select concat("-",a,"-",b,"-") from t1 where b="hello";
concat("-",a,"-",b,"-")
-hello-hello-
select concat("-",a,"-",b,"-") from t1 where b="hello ";
concat("-",a,"-",b,"-")
select concat("-",a,"-",b,"-") from t1 ignore index (b) where b="hello ";
concat("-",a,"-",b,"-")
alter table t1 modify b tinytext not null, drop key b, add key (b(100));
select concat("-",a,"-",b,"-") from t1;
concat("-",a,"-",b,"-")
-hello-hello-
-hello2-hello2-
select concat("-",a,"-",b,"-") from t1 where b="hello ";
concat("-",a,"-",b,"-")
-hello-hello-
select concat("-",a,"-",b,"-") from t1 ignore index (b) where b="hello ";
concat("-",a,"-",b,"-")
-hello-hello-
drop table t1;
create table t1 (b char(8));
insert into t1 values(NULL);
select b from t1 where binary b like '';
b
select b from t1 group by binary b like '';
b
NULL
select b from t1 having binary b like '';
b
drop table t1;
create table t1 (a char(15) binary, b binary(15));
insert into t1 values ('aaa','bbb'),('AAA','BBB');
select upper(a),upper(b) from t1;
upper(a) upper(b)
AAA bbb
AAA BBB
select lower(a),lower(b) from t1;
lower(a) lower(b)
aaa bbb
aaa BBB
select * from t1 where upper(a)='AAA';
a b
aaa bbb
AAA BBB
select * from t1 where lower(a)='aaa';
a b
aaa bbb
AAA BBB
select * from t1 where upper(b)='BBB';
a b
AAA BBB
select * from t1 where lower(b)='bbb';
a b
aaa bbb
select charset(a), charset(b), charset(binary 'ccc') from t1 limit 1;
charset(a) charset(b) charset(binary 'ccc')
latin1 binary latin1
select collation(a), collation(b), collation(binary 'ccc') from t1 limit 1;
collation(a) collation(b) collation(binary 'ccc')
latin1_bin binary latin1_bin
drop table t1;
|
