• 数据库中关于convert的参数学习(转化函数用法)


    该页面中的内容来之http://www.cnblogs.com/xionglee/articles/1444916.html,以前我一直不知道当中的1,2,3表示什么,现在才知道呀!style

    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.

    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) 
    ------------------------------------------------------------------------------------------------------------

     1 --语句及查询结果:
     2 SELECT CONVERT(varchar(100), GETDATE(), 0): 05 16 2006 10:57AM
     3 SELECT CONVERT(varchar(100), GETDATE(), 1): 05/16/06
     4 SELECT CONVERT(varchar(100), GETDATE(), 2): 06.05.16
     5 SELECT CONVERT(varchar(100), GETDATE(), 3): 16/05/06
     6 SELECT CONVERT(varchar(100), GETDATE(), 4): 16.05.06
     7 SELECT CONVERT(varchar(100), GETDATE(), 5): 16-05-06
     8 SELECT CONVERT(varchar(100), GETDATE(), 6): 16 05 06
     9 SELECT CONVERT(varchar(100), GETDATE(), 7): 05 16, 06
    10 SELECT CONVERT(varchar(100), GETDATE(), 8): 10:57:46
    11 SELECT CONVERT(varchar(100), GETDATE(), 9): 05 16 2006 10:57:46:827AM
    12 SELECT CONVERT(varchar(100), GETDATE(), 10): 05-16-06
    13 SELECT CONVERT(varchar(100), GETDATE(), 11): 06/05/16
    14 SELECT CONVERT(varchar(100), GETDATE(), 12): 060516
    15 SELECT CONVERT(varchar(100), GETDATE(), 13): 16 05 2006 10:57:46:937
    16 SELECT CONVERT(varchar(100), GETDATE(), 14): 10:57:46:967
    17 SELECT CONVERT(varchar(100), GETDATE(), 20): 2006-05-16 10:57:47
    18 SELECT CONVERT(varchar(100), GETDATE(), 21): 2006-05-16 10:57:47.157
    19 SELECT CONVERT(varchar(100), GETDATE(), 22): 05/16/06 10:57:47 AM
    20 SELECT CONVERT(varchar(100), GETDATE(), 23): 2006-05-16
    21 SELECT CONVERT(varchar(100), GETDATE(), 24): 10:57:47
    22 SELECT CONVERT(varchar(100), GETDATE(), 25): 2006-05-16 10:57:47.250
    23 SELECT CONVERT(varchar(100), GETDATE(), 100): 05 16 2006 10:57AM
    24 SELECT CONVERT(varchar(100), GETDATE(), 101): 05/16/2006
    25 SELECT CONVERT(varchar(100), GETDATE(), 102): 2006.05.16
    26 SELECT CONVERT(varchar(100), GETDATE(), 103): 16/05/2006
    27 SELECT CONVERT(varchar(100), GETDATE(), 104): 16.05.2006
    28 SELECT CONVERT(varchar(100), GETDATE(), 105): 16-05-2006
    29 SELECT CONVERT(varchar(100), GETDATE(), 106): 16 05 2006
    30 SELECT CONVERT(varchar(100), GETDATE(), 107): 05 16, 2006
    31 SELECT CONVERT(varchar(100), GETDATE(), 108): 10:57:49
    32 SELECT CONVERT(varchar(100), GETDATE(), 109): 05 16 2006 10:57:49:437AM
    33 SELECT CONVERT(varchar(100), GETDATE(), 110): 05-16-2006
    34 SELECT CONVERT(varchar(100), GETDATE(), 111): 2006/05/16
    35 SELECT CONVERT(varchar(100), GETDATE(), 112): 20060516
    36 SELECT CONVERT(varchar(100), GETDATE(), 113): 16 05 2006 10:57:49:513
    37 SELECT CONVERT(varchar(100), GETDATE(), 114): 10:57:49:547
    38 SELECT CONVERT(varchar(100), GETDATE(), 120): 2006-05-16 10:57:49
    39 SELECT CONVERT(varchar(100), GETDATE(), 121): 2006-05-16 10:57:49:000
     1 --原来字符串可以加,我还真不知道呢!
     2 select getdate()
     3 select 'hello'+' 08:15:20'
     4 select convert(varchar(max),getdate(),120)+' 08:15:20'
     5 select convert(varchar(max),getdate(),24)+' 08:15:20'
     6 select convert(varchar(max),getdate(),24)+' 08:15:20'
     7 select convert(varchar(max),getdate(),24)+' 08:15:20'
     8 select convert(varchar(max),getdate(),24)+' 08:15:20'
     9 --昨天这个时刻到今天这个时刻
    10 select getdate()-1,getdate()+1
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  • 原文地址:https://www.cnblogs.com/TheoryDance/p/4736975.html
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