SQL.Mysql中Cast()函数的用法

之前讲到了orcale的字符串与日期等类型的转换,现在我们来看看Mysql是怎么转换的。比起orcale,MySQL相比之下就简单得多了,只需要一个Cast()函数就能搞定。其语法为: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

例如表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

select cast(date as datetime) as date from  table1;

结果如下:

date

2015-11-03 15:31:26

select cast(date as date) as date from  table1;

结果如下:

date

2015-11-03

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

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