标签:char 使用 sign span sel 法规 mysq weight ima
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:
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; 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
标签:char 使用 sign span sel 法规 mysq weight ima
原文地址:https://www.cnblogs.com/huanghuanghui/p/9392285.html