SQL中CONVERT轉(zhuǎn)化函數(shù)的用法
CONVERT的使用方法:
////////////////////////////////////////////////////////////////////////////////////////
格式:
CONVERT(data_type,expression[,style])
說明:
此樣式一般在時間類型(datetime,smalldatetime)與字符串類型(nchar,nvarchar,char,varchar)
相互轉(zhuǎn)換的時候才用到.
例子:
SELECT CONVERT(varchar(30),getdate(),101) now
結(jié)果為
now
---------------------------------------
09/15/2001
/////////////////////////////////////////////////////////////////////////////////////
style數(shù)字在轉(zhuǎn)換時間時的含義如下
-------------------------------------------------------------------------------------------------
Style(2位表示年份) | Style(4位表示年份) | 輸入輸出格式
-------------------------------------------------------------------------------------------------
- | 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小時制)
-------------------------------------------------------------------------------------------------
14 | 114 | hh:mi:ss:mmm(24小時制)
-------------------------------------------------------------------------------------------------
- | 20 or 120 | yyyy-mm-dd hh:mi:ss(24小時制)
-------------------------------------------------------------------------------------------------
- | 21 or 121 | yyyy-mm-dd hh:mi:ss:mmm(24小時制)
-------------------------------------------------------------------------------------------------
concat方法的結(jié)果等于:result = string1 + string2 + string3 + … + stringN