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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'' as char character set cp1251);
cast(_koi8r'' as char character set cp1251)
create table t1 select cast(_koi8r'' 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'' AS nchar) as c1,
cast(_koi8r' ' AS nchar) as c2,
cast(_koi8r'' AS nchar(2)) as c3,
cast(_koi8r' ' AS nchar(2)) as c4,
cast(_koi8r'' AS nchar(2)) as c5;
c1 c2 c3 c4 c5
фг ф фг ф ф
create table t1 select
cast(_koi8r'' AS nchar) as c1,
cast(_koi8r' ' AS nchar) as c2,
cast(_koi8r'' AS nchar(2)) as c3,
cast(_koi8r' ' AS nchar(2)) as c4,
cast(_koi8r'' 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'',_binary'');
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)
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)
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)
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;
select date_add(cast('2004-12-30 12:00:00' as date), interval 0 hour);
date_add(cast('2004-12-30 12:00:00' as date), interval 0 hour)
2004-12-30 00:00:00
select timediff(cast('2004-12-30 12:00:00' as time), '12:00:00');
timediff(cast('2004-12-30 12:00:00' as time), '12:00:00')
00:00:00
select timediff(cast('1 12:00:00' as time), '12:00:00');
timediff(cast('1 12:00:00' as time), '12:00:00')
24:00:00
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