详细讲解SQL中CONVERT转化函数的用法

格式:

CONVERT(data_type,expression[,style])

说明:

此样式一般在时间类型(datetime,smalldatetime)与字符串类型(nchar,nvarchar,char,varchar)

相互转换的时候才用到.

例子:

Select CONVERT(varchar(30),getdate(),101) now

结果为

now

---------------------------------------

09/15/2001

///////////////////////////////////////////////////////////////

style数字在转换时间时的含义如下

---------------------------------------------------------------

Style(2位表示年份) | Style(4位表示年份) | 输入输出格式

---------------------------------------------------------------

- | 0 or 100 | mon dd yyyy hh:miAM(或PM)

---------------------------------------------------------------

1 | 101 | mm/dd/yy

----------------------------------------------------------------

-----------------------------

2 | 102 | yy-mm-dd

------------------------------------------------------------------

3 | 103 | dd/mm/yy

-------------

-------------------------------------------------------------------

4 | 104 | dd-mm-yy

-------------------------------------------------------------------

5 | 105 | dd-mm-yy

-------------------------------------------------------------------

6 | 106 | dd mon yy

-------------------------------------------------------------------

7 | 107 | mon dd,yy

----------------------------------------------------------------------

8 | 108 | hh:mm:ss

----------------------------------------------------------------------

- | 9 or 109 | mon dd yyyy hh:mi:ss:mmmmAM(或PM)

----------------------------------------------------------------------

10 | 110 | mm-dd-yy

-----------------------------------------------------------------------

11 | 111 | yy/mm/dd

----------------------------------------------------------------------

12 | 112 | yymmdd

-----------------------------------------------------------------------

- | 13 or 113 | dd mon yyyy hh:mi:ss:mmm(24小时制)

-----------------------------------------------------------------------

14 | 114 | hh:mi:ss:mmm(24小时制)

------------------------------------------------------------------------

- | 20 or 120 | yyyy-mm-dd hh:mi:ss(24小时制)

-------------------------------------------------------------------------

- | 21 or 121 | yyyy-mm-dd hh:mi:ss:mmm(24小时制)