SQL convert 用法

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CONVERT(data_type,expression[,style])

convert(varchar(10),字段名,转换格式)

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                                  | 100                              |      mon dd yyyy hh:miAM(或PM)
------------------------------------------------------------------------------------------------------------
1                                  |     101      美国                   |      mm/dd/yy
------------------------------------------------------------------------------------------------------------
2                                  |     102       ANSI                  |      yy-mm-dd
------------------------------------------------------------------------------------------------------------
3                                  |     103       英法                   |      dd/mm/yy
------------------------------------------------------------------------------------------------------------
4                                  |     104       德国                   |      dd.mm.yy
------------------------------------------------------------------------------------------------------------
5                                  |     105       意大利                |      dd-mm-yy
------------------------------------------------------------------------------------------------------------
6                                  |     106                               |      dd mon yy
------------------------------------------------------------------------------------------------------------
7                                  |     107                               |      mon dd,yy
------------------------------------------------------------------------------------------------------------
8                                  |     108                               |      hh:mm:ss
------------------------------------------------------------------------------------------------------------
9                                  |     109                               |      mon dd yyyy hh:mi:ss:mmmmAM(或PM)
------------------------------------------------------------------------------------------------------------
10                                |     110       美国                    |      mm-dd-yy
------------------------------------------------------------------------------------------------------------
11                                |     111       日本                    |      yy/mm/dd
------------------------------------------------------------------------------------------------------------
12                                |     112       ISO                     |      yymmdd
------------------------------------------------------------------------------------------------------------
13                                |     113        欧洲默认值        |      dd mon yyyy hh:mi:ss:mmm(24小时制)
------------------------------------------------------------------------------------------------------------
14                                |     114                               |      hh:mi:ss:mmm(24小时制)
------------------------------------------------------------------------------------------------------------
20                                |     120        ODBC 规范        |       yyyy-mm-dd hh:mi:ss(24小时制)
------------------------------------------------------------------------------------------------------------
21                                |      121                              |       yyyy-mm-dd hh:mi:ss:mmm(24小时制)
------------------------------------------------------------------------------------------------------------