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
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
|
select CAST(1-2 AS UNSIGNED);
CAST(1-2 AS UNSIGNED)
18446744073709551615
select CAST(CAST(1-2 AS UNSIGNED) AS SIGNED INTEGER);
CAST(CAST(1-2 AS UNSIGNED) AS SIGNED INTEGER)
-1
select CONVERT('-1',UNSIGNED);
CONVERT('-1',UNSIGNED)
18446744073709551615
select cast(-5 as unsigned) | 1, cast(-5 as unsigned) & -1;
cast(-5 as unsigned) | 1 cast(-5 as unsigned) & -1
18446744073709551611 18446744073709551611
select cast(-5 as unsigned) -1, cast(-5 as unsigned) + 1;
cast(-5 as unsigned) -1 cast(-5 as unsigned) + 1
18446744073709551610 18446744073709551612
select ~5, cast(~5 as signed);
~5 cast(~5 as signed)
18446744073709551610 -6
explain extended select ~5, cast(~5 as signed);
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL No tables used
Warnings:
Note 1003 select ~(5) AS `~5`,cast(~(5) as signed) AS `cast(~5 as signed)`
select cast(5 as unsigned) -6.0;
cast(5 as unsigned) -6.0
-1.0
select cast(NULL as signed), cast(1/0 as signed);
cast(NULL as signed) cast(1/0 as signed)
NULL NULL
select cast(NULL as unsigned), cast(1/0 as unsigned);
cast(NULL as unsigned) cast(1/0 as unsigned)
NULL NULL
select cast("A" as binary) = "a", cast(BINARY "a" as CHAR) = "A";
cast("A" as binary) = "a" cast(BINARY "a" as CHAR) = "A"
0 1
select cast("2001-1-1" as DATE), cast("2001-1-1" as DATETIME);
cast("2001-1-1" as DATE) cast("2001-1-1" as DATETIME)
2001-01-01 2001-01-01 00:00:00
select cast("1:2:3" as TIME);
cast("1:2:3" as TIME)
01:02:03
select CONVERT("2004-01-22 21:45:33",DATE);
CONVERT("2004-01-22 21:45:33",DATE)
2004-01-22
select CONVERT(DATE "2004-01-22 21:45:33" USING latin1);
CONVERT(DATE "2004-01-22 21:45:33" USING latin1)
2004-01-22 21:45:33
select CONVERT(DATE "2004-01-22 21:45:33",CHAR);
CONVERT(DATE "2004-01-22 21:45:33",CHAR)
2004-01-22 21:45:33
select CONVERT(DATE "2004-01-22 21:45:33",CHAR(4));
CONVERT(DATE "2004-01-22 21:45:33",CHAR(4))
2004
select CONVERT(DATE "2004-01-22 21:45:33",BINARY(4));
CONVERT(DATE "2004-01-22 21:45:33",BINARY(4))
2004
select CAST(DATE "2004-01-22 21:45:33" AS BINARY(4));
CAST(DATE "2004-01-22 21:45:33" AS BINARY(4))
2004
set names binary;
select cast(_latin1'test' as char character set latin2);
cast(_latin1'test' as char character set latin2)
test
select cast(_koi8r'ÔÅÓÔ' as char character set cp1251);
cast(_koi8r'ÔÅÓÔ' as char character set cp1251)
òåñò
create table t1 select cast(_koi8r'ÔÅÓÔ' as char character set cp1251) as t;
show create table t1;
Table Create Table
t1 CREATE TABLE `t1` (
`t` char(4) character set cp1251 NOT NULL default ''
) ENGINE=MyISAM DEFAULT CHARSET=latin1
drop table t1;
select
cast(_latin1'ab' AS char) as c1,
cast(_latin1'a ' AS char) as c2,
cast(_latin1'abc' AS char(2)) as c3,
cast(_latin1'a ' AS char(2)) as c4,
cast(_latin1'a' AS char(2)) as c5;
c1 c2 c3 c4 c5
ab a ab a a
create table t1 select
cast(_latin1'ab' AS char) as c1,
cast(_latin1'a ' AS char) as c2,
cast(_latin1'abc' AS char(2)) as c3,
cast(_latin1'a ' AS char(2)) as c4,
cast(_latin1'a' AS char(2)) as c5;
select * from t1;
c1 c2 c3 c4 c5
ab a ab a a
show create table t1;
Table Create Table
t1 CREATE TABLE `t1` (
`c1` binary(2) NOT NULL default '',
`c2` binary(2) NOT NULL default '',
`c3` binary(2) NOT NULL default '',
`c4` binary(2) NOT NULL default '',
`c5` binary(2) NOT NULL default ''
) ENGINE=MyISAM DEFAULT CHARSET=latin1
drop table t1;
select
cast(_koi8r'ÆÇ' AS nchar) as c1,
cast(_koi8r'Æ ' AS nchar) as c2,
cast(_koi8r'ÆÇÈ' AS nchar(2)) as c3,
cast(_koi8r'Æ ' AS nchar(2)) as c4,
cast(_koi8r'Æ' AS nchar(2)) as c5;
c1 c2 c3 c4 c5
фг ф фг ф ф
create table t1 select
cast(_koi8r'ÆÇ' AS nchar) as c1,
cast(_koi8r'Æ ' AS nchar) as c2,
cast(_koi8r'ÆÇÈ' AS nchar(2)) as c3,
cast(_koi8r'Æ ' AS nchar(2)) as c4,
cast(_koi8r'Æ' AS nchar(2)) as c5;
select * from t1;
c1 c2 c3 c4 c5
фг ф фг ф ф
show create table t1;
Table Create Table
t1 CREATE TABLE `t1` (
`c1` char(2) character set utf8 NOT NULL default '',
`c2` char(2) character set utf8 NOT NULL default '',
`c3` char(2) character set utf8 NOT NULL default '',
`c4` char(2) character set utf8 NOT NULL default '',
`c5` char(2) character set utf8 NOT NULL default ''
) ENGINE=MyISAM DEFAULT CHARSET=latin1
drop table t1;
create table t1 (a binary(10), b char(10) character set koi8r);
insert into t1 values (_binary'ÔÅÓÔ',_binary'ÔÅÓÔ');
select a,b,cast(a as char character set cp1251),cast(b as binary) from t1;
a b cast(a as char character set cp1251) cast(b as binary)
ÔÅÓÔ ÔÅÓÔ ÔÅÓÔ ÔÅÓÔ
set names koi8r;
select a,b,cast(a as char character set cp1251),cast(b as binary) from t1;
a b cast(a as char character set cp1251) cast(b as binary)
ÔÅÓÔ ÔÅÓÔ æåõæ ÔÅÓÔ
set names cp1251;
select a,b,cast(a as char character set cp1251),cast(b as binary) from t1;
a b cast(a as char character set cp1251) cast(b as binary)
ÔÅÓÔ òåñò ÔÅÓÔ ÔÅÓÔ
drop table t1;
set names binary;
select cast("2001-1-1" as date) = "2001-01-01";
cast("2001-1-1" as date) = "2001-01-01"
1
select cast("2001-1-1" as datetime) = "2001-01-01 00:00:00";
cast("2001-1-1" as datetime) = "2001-01-01 00:00:00"
1
select cast("1:2:3" as TIME) = "1:02:03";
cast("1:2:3" as TIME) = "1:02:03"
0
select cast(NULL as DATE);
cast(NULL as DATE)
NULL
select cast(NULL as BINARY);
cast(NULL as BINARY)
NULL
CREATE TABLE t1 (a enum ('aac','aab','aaa') not null);
INSERT INTO t1 VALUES ('aaa'),('aab'),('aac');
SELECT a, CAST(a AS CHAR) FROM t1 ORDER BY CAST(a AS UNSIGNED) ;
a CAST(a AS CHAR)
aac aac
aab aab
aaa aaa
SELECT a, CAST(a AS CHAR(3)) FROM t1 ORDER BY CAST(a AS CHAR(2)), a;
a CAST(a AS CHAR(3))
aac aac
aab aab
aaa aaa
SELECT a, CAST(a AS UNSIGNED) FROM t1 ORDER BY CAST(a AS CHAR) ;
a CAST(a AS UNSIGNED)
aaa 3
aab 2
aac 1
SELECT a, CAST(a AS CHAR(2)) FROM t1 ORDER BY CAST(a AS CHAR(3)), a;
a CAST(a AS CHAR(2))
aaa aa
aab aa
aac aa
DROP TABLE t1;
|
