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  • SQL中CONVERT转化函数的用法

    CONVERT的使用方法:

    select  * from 表名 order by CONVERT(DATETIME,字段,120) desc

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

    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(
    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(
    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)
    -------------------------------------------------------------------------------------------------

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  • 原文地址:https://www.cnblogs.com/ly5201314/p/1348650.html
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