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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型
• 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