一、语法
Cast(字段名 as 转换的类型 )
转换的类型:
- CHAR[(N)] 字符型
- DATE 日期型
- DATETIME 日期和时间型
- DECIMAL float型
- SIGNED int
- TIME 时间型
二、用法
表tbl_user
date:2018-11-03 15:31:26
例1
select cast(date as signed) as date from tbl_user;
结果如下:
date:20181103153126
例2
select cast(date as char) as date from tbl_user;
结果如下:
date:2018-11-03 15:31:26
例3
select cast(date as datetime) as date from tbl_user;
结果如下:
date:2018-11-03 15:31:26
例4
select cast(date as date) as date from tbl_user;
结果如下:
date:2018-11-03