cast.result

开启mysql的远程连接的方法 mysql-noinstall-5.1.6-alpha-win32.zip

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 CAST('10 ' as unsigned integer);
CAST('10 ' as unsigned integer)
10
Warnings:
Warning	1292	Truncated incorrect INTEGER value: '10 '
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 10+'10';
10+'10'
20
select 10.0+'10';
10.0+'10'
20
select 10E+0+'10';
10E+0+'10'
20
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
Warnings:
Warning	1292	Truncated incorrect CHAR(4) value: '2004-01-22 21:45:33'
select CONVERT(DATE "2004-01-22 21:45:33",BINARY(4));
CONVERT(DATE "2004-01-22 21:45:33",BINARY(4))
2004
Warnings:
Warning	1292	Truncated incorrect BINARY(4) value: '2004-01-22 21:45:33'
select CAST(DATE "2004-01-22 21:45:33" AS BINARY(4));
CAST(DATE "2004-01-22 21:45:33" AS BINARY(4))
2004
Warnings:
Warning	1292	Truncated incorrect BINARY(4) value: '2004-01-22 21:45:33'
select CAST(0xb3 as signed);
CAST(0xb3 as signed)
179
select CAST(0x8fffffffffffffff as signed);
CAST(0x8fffffffffffffff as signed)
-8070450532247928833
select CAST(0xffffffffffffffff as unsigned);
CAST(0xffffffffffffffff as unsigned)
18446744073709551615
select CAST(0xfffffffffffffffe as signed);
CAST(0xfffffffffffffffe as signed)
-2
select cast('-10a' as signed integer);
cast('-10a' as signed integer)
-10
Warnings:
Warning	1292	Truncated incorrect INTEGER value: '-10a'
select cast('a10' as unsigned integer);
cast('a10' as unsigned integer)
0
Warnings:
Warning	1292	Truncated incorrect INTEGER value: 'a10'
select 10+'a';
10+'a'
10
Warnings:
Warning	1292	Truncated incorrect DOUBLE value: 'a'
select 10.0+cast('a' as decimal);
10.0+cast('a' as decimal)
10.00
Warnings:
Warning	1292	Truncated incorrect DECIMAL value: 'a'
select 10E+0+'a';
10E+0+'a'
10
Warnings:
Warning	1292	Truncated incorrect DOUBLE value: 'a'
select cast('18446744073709551616' as unsigned);
cast('18446744073709551616' as unsigned)
18446744073709551615
Warnings:
Warning	1292	Truncated incorrect INTEGER value: '18446744073709551616'
select cast('18446744073709551616' as signed);
cast('18446744073709551616' as signed)
-1
Warnings:
Warning	1292	Truncated incorrect INTEGER value: '18446744073709551616'
select cast('9223372036854775809' as signed);
cast('9223372036854775809' as signed)
-9223372036854775807
Warnings:
Warning	1105	Cast to signed converted positive out-of-range integer to it's negative complement
select cast('-1' as unsigned);
cast('-1' as unsigned)
18446744073709551615
Warnings:
Warning	1105	Cast to unsigned converted negative integer to it's positive complement
select cast('abc' as signed);
cast('abc' as signed)
0
Warnings:
Warning	1292	Truncated incorrect INTEGER value: 'abc'
select cast('1a' as signed);
cast('1a' as signed)
1
Warnings:
Warning	1292	Truncated incorrect INTEGER value: '1a'
select cast('' as signed);
cast('' as signed)
0
Warnings:
Warning	1292	Truncated incorrect INTEGER value: ''
set names binary;
select cast(_latin1'test' as char character set latin2);
cast(_latin1'test' as char character set latin2)
test
select cast(_koi8r'耘釉' as char character set cp1251);
cast(_koi8r'耘釉' as char character set cp1251)
蝈耱
create table t1 select cast(_koi8r'耘釉' as char character set cp1251) as t;
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `t` varchar(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,
hex(cast(_latin1'a'   AS char(2))) as c5;
c1	c2	c3	c4	c5
ab	a 	ab	a 	6100
Warnings:
Warning	1292	Truncated incorrect BINARY(2) value: 'abc'
Warning	1292	Truncated incorrect BINARY(2) value: 'a  '
select cast(1000 as CHAR(3));
cast(1000 as CHAR(3))
100
Warnings:
Warning	1292	Truncated incorrect BINARY(3) value: '1000'
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;
Warnings:
Warning	1292	Truncated incorrect BINARY(2) value: 'abc'
Warning	1292	Truncated incorrect BINARY(2) value: 'a  '
select c1,c2,c3,c4,hex(c5) from t1;
c1	c2	c3	c4	hex(c5)
ab	a 	ab	a 	6100
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `c1` varbinary(2) NOT NULL default '',
  `c2` varbinary(2) NOT NULL default '',
  `c3` varbinary(2) NOT NULL default '',
  `c4` varbinary(2) NOT NULL default '',
  `c5` varbinary(2) NOT NULL default ''
) ENGINE=MyISAM DEFAULT CHARSET=latin1
drop table t1;
select
cast(_koi8r'魄'  AS nchar)    as c1,
cast(_koi8r'