mysql中cast用法
语法:CAST( value AS type )
type的类型有
value | 描述 |
---|---|
DATE | 日期,格式为 'YYYY-MM-DD'. |
DATETIME | 日期加具体的时间,格式为 'YYYY-MM-DD HH:MM:SS'. |
TIME | 时间,格式为 'HH:MM:SS'. |
CHAR | 字符型 |
SIGNED | int |
UNSIGNED | 无符号int |
BINARY | 二进制型 |
DECIMAL | float型 |
select cast(20.3456 as decimal(10, 2)) as num
//结果:20.35
select cast('2019-03-08 15:31:26' as datetime ) as date
//结果:2019-03-08 15:31:26
select cast('2019-03-08 15:31:26' as date ) as date
//结果:2019-03-08
select cast('2019-03-08 15:31:26' as time ) as date
//结果:15:31:26
select cast('2015-11-03 15:31:26' as char ) as date
//结果:2015-11-03 15:31:26
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