阿里云-maxcompute---sql语法

1.CAST

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