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
|
drop table if exists t1;
create table t1 (a varchar(10), key(a));
insert into t1 values ("a"),("abc"),("abcd"),("hello"),("test");
explain select * from t1 where a like 'abc%';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a a 11 NULL 1 Using where; Using index
explain select * from t1 where a like concat('abc','%');
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a a 11 NULL 1 Using where; Using index
select * from t1 where a like "abc%";
a
abc
abcd
select * from t1 where a like concat("abc","%");
a
abc
abcd
select * from t1 where a like "ABC%";
a
abc
abcd
select * from t1 where a like "test%";
a
test
select * from t1 where a like "te_t";
a
test
select * from t1 where a like "%a%";
a
a
abc
abcd
select * from t1 where a like "%abcd%";
a
abcd
select * from t1 where a like "%abc\d%";
a
abcd
drop table t1;
create table t1 (a varchar(10), key(a));
insert into t1 values ('a'), ('a\\b');
select * from t1 where a like 'a\\%' escape '#';
a
a\b
select * from t1 where a like 'a\\%' escape '#' and a like 'a\\\\b';
a
a\b
drop table t1;
SET NAMES koi8r;
CREATE TABLE t1 (a VARCHAR(10) CHARACTER SET koi8r);
INSERT INTO t1 VALUES ('ÆÙ×Á'),('æÙ×Á'),('Æù×Á'),('ÆÙ÷Á'),('ÆÙ×á'),('æù÷á');
INSERT INTO t1 VALUES ('ÆÙ×ÁÐÒÏÌÄÖ'),('æÙ×ÁÐÒÏÌÄÖ'),('Æù×ÁÐÒÏÌÄÖ'),('ÆÙ÷ÁÐÒÏÌÄÖ');
INSERT INTO t1 VALUES ('ÆÙ×áÐÒÏÌÄÖ'),('ÆÙ×ÁðÒÏÌÄÖ'),('ÆÙ×ÁÐòÏÌÄÖ'),('ÆÙ×ÁÐÒïÌÄÖ');
INSERT INTO t1 VALUES ('ÆÙ×ÁÐÒÏìÄÖ'),('ÆÙ×ÁÐÒÏÌäÖ'),('ÆÙ×ÁÐÒÏÌÄö'),('æù÷áðòïìäö');
SELECT * FROM t1 WHERE a LIKE '%Æù×Á%';
a
ÆÙ×Á
æÙ×Á
Æù×Á
ÆÙ÷Á
ÆÙ×á
æù÷á
ÆÙ×ÁÐÒÏÌÄÖ
æÙ×ÁÐÒÏÌÄÖ
Æù×ÁÐÒÏÌÄÖ
ÆÙ÷ÁÐÒÏÌÄÖ
ÆÙ×áÐÒÏÌÄÖ
ÆÙ×ÁðÒÏÌÄÖ
ÆÙ×ÁÐòÏÌÄÖ
ÆÙ×ÁÐÒïÌÄÖ
ÆÙ×ÁÐÒÏìÄÖ
ÆÙ×ÁÐÒÏÌäÖ
ÆÙ×ÁÐÒÏÌÄö
æù÷áðòïìäö
SELECT * FROM t1 WHERE a LIKE '%Æù×%';
a
ÆÙ×Á
æÙ×Á
Æù×Á
ÆÙ÷Á
ÆÙ×á
æù÷á
ÆÙ×ÁÐÒÏÌÄÖ
æÙ×ÁÐÒÏÌÄÖ
Æù×ÁÐÒÏÌÄÖ
ÆÙ÷ÁÐÒÏÌÄÖ
ÆÙ×áÐÒÏÌÄÖ
ÆÙ×ÁðÒÏÌÄÖ
ÆÙ×ÁÐòÏÌÄÖ
ÆÙ×ÁÐÒïÌÄÖ
ÆÙ×ÁÐÒÏìÄÖ
ÆÙ×ÁÐÒÏÌäÖ
ÆÙ×ÁÐÒÏÌÄö
æù÷áðòïìäö
SELECT * FROM t1 WHERE a LIKE 'Æù×Á%';
a
ÆÙ×Á
æÙ×Á
Æù×Á
ÆÙ÷Á
ÆÙ×á
æù÷á
ÆÙ×ÁÐÒÏÌÄÖ
æÙ×ÁÐÒÏÌÄÖ
Æù×ÁÐÒÏÌÄÖ
ÆÙ÷ÁÐÒÏÌÄÖ
ÆÙ×áÐÒÏÌÄÖ
ÆÙ×ÁðÒÏÌÄÖ
ÆÙ×ÁÐòÏÌÄÖ
ÆÙ×ÁÐÒïÌÄÖ
ÆÙ×ÁÐÒÏìÄÖ
ÆÙ×ÁÐÒÏÌäÖ
ÆÙ×ÁÐÒÏÌÄö
æù÷áðòïìäö
DROP TABLE t1;
SET NAMES cp1250;
CREATE TABLE t1 (a varchar(250) NOT NULL) DEFAULT CHARACTER SET=cp1250;
INSERT INTO t1 VALUES
('Techni Tapes Sp. z o.o.'),
('Pojazdy Szynowe PESA Bydgoszcz SA Holding'),
('AKAPESTER 1 P.P.H.U.'),
('Pojazdy Szynowe PESA Bydgoszcz S A Holding'),
('PPUH PESKA-I Maria Struniarska');
select * from t1 where a like '%PESA%';
a
Pojazdy Szynowe PESA Bydgoszcz SA Holding
Pojazdy Szynowe PESA Bydgoszcz S A Holding
select * from t1 where a like '%PESA %';
a
Pojazdy Szynowe PESA Bydgoszcz SA Holding
Pojazdy Szynowe PESA Bydgoszcz S A Holding
select * from t1 where a like '%PES%';
a
Techni Tapes Sp. z o.o.
Pojazdy Szynowe PESA Bydgoszcz SA Holding
AKAPESTER 1 P.P.H.U.
Pojazdy Szynowe PESA Bydgoszcz S A Holding
PPUH PESKA-I Maria Struniarska
select * from t1 where a like '%PESKA%';
a
PPUH PESKA-I Maria Struniarska
select * from t1 where a like '%ESKA%';
a
PPUH PESKA-I Maria Struniarska
DROP TABLE t1;
|
