CAST函数语法规则是:Cast(字段名 as 转换的类型 ),其中类型可以为:
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
实例1:
表table1 date:2015-11-03 15:31:26 select cast(date as signed) as date from table1;
结果如下:
date:20151103153126
select cast(date as char) as date from table1;
结果如下:
date:2015-11-03 15:31:26
实例2:
select cast(date as datetime) as date from table1;
结果如下:
date:2015-11-03 15:31:26
实例3:
select cast(date as date) as date from table1;
结果如下:
date:2015-11-03
实例4:
select cast(date as time) as date from table1;
实例4:
select cast(date as time) as date from table1;
结果如下:
date:15:31:26
这里date对应日期,time对应时间
实例5:
表table2 num:20 select cast(num as decimal(10, 2)) as num from table2
结果如下:
num:20.00