zoukankan      html  css  js  c++  java
  • SQL中CONVERT转化函数的用法学习

    SQL中CONVERT转化函数的用法学习

    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                               | 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) 
    ------------------------------------------------------------------------------------------------------------

    语句及查询结果:
    SELECT CONVERT(varchar(100), GETDATE(), 0): 05 16 2006 10:57AM
    SELECT CONVERT(varchar(100), GETDATE(), 1): 05/16/06
    SELECT CONVERT(varchar(100), GETDATE(), 2): 06.05.16
    SELECT CONVERT(varchar(100), GETDATE(), 3): 16/05/06
    SELECT CONVERT(varchar(100), GETDATE(), 4): 16.05.06
    SELECT CONVERT(varchar(100), GETDATE(), 5): 16-05-06
    SELECT CONVERT(varchar(100), GETDATE(), 6): 16 05 06
    SELECT CONVERT(varchar(100), GETDATE(), 7): 05 1606
    SELECT CONVERT(varchar(100), GETDATE(), 8): 10:57:46
    SELECT CONVERT(varchar(100), GETDATE(), 9): 05 16 2006 10:57:46:827AM
    SELECT CONVERT(varchar(100), GETDATE(), 10): 05-16-06
    SELECT CONVERT(varchar(100), GETDATE(), 11): 06/05/16
    SELECT CONVERT(varchar(100), GETDATE(), 12): 060516
    SELECT CONVERT(varchar(100), GETDATE(), 13): 16 05 2006 10:57:46:937
    SELECT CONVERT(varchar(100), GETDATE(), 14): 10:57:46:967
    SELECT CONVERT(varchar(100), GETDATE(), 20): 2006-05-16 10:57:47
    SELECT CONVERT(varchar(100), GETDATE(), 21): 2006-05-16 10:57:47.157
    SELECT CONVERT(varchar(100), GETDATE(), 22): 05/16/06 10:57:47 AM
    SELECT CONVERT(varchar(100), GETDATE(), 23): 2006-05-16
    SELECT CONVERT(varchar(100), GETDATE(), 24): 10:57:47
    SELECT CONVERT(varchar(100), GETDATE(), 25): 2006-05-16 10:57:47.250
    SELECT CONVERT(varchar(100), GETDATE(), 100): 05 16 2006 10:57AM
    SELECT CONVERT(varchar(100), GETDATE(), 101): 05/16/2006
    SELECT CONVERT(varchar(100), GETDATE(), 102): 2006.05.16
    SELECT CONVERT(varchar(100), GETDATE(), 103): 16/05/2006
    SELECT CONVERT(varchar(100), GETDATE(), 104): 16.05.2006
    SELECT CONVERT(varchar(100), GETDATE(), 105): 16-05-2006
    SELECT CONVERT(varchar(100), GETDATE(), 106): 16 05 2006
    SELECT CONVERT(varchar(100), GETDATE(), 107): 05 162006
    SELECT CONVERT(varchar(100), GETDATE(), 108): 10:57:49
    SELECT CONVERT(varchar(100), GETDATE(), 109): 05 16 2006 10:57:49:437AM
    SELECT CONVERT(varchar(100), GETDATE(), 110): 05-16-2006
    SELECT CONVERT(varchar(100), GETDATE(), 111): 2006/05/16
    SELECT CONVERT(varchar(100), GETDATE(), 112): 20060516
    SELECT CONVERT(varchar(100), GETDATE(), 113): 16 05 2006 10:57:49:513
    SELECT CONVERT(varchar(100), GETDATE(), 114): 10:57:49:547
    SELECT CONVERT(varchar(100), GETDATE(), 120): 2006-05-16 10:57:49
    SELECT CONVERT(varchar(100), GETDATE(), 121): 2006
  • 相关阅读:
    iOS resign code with App Store profile and post to AppStore
    HTTPS科普扫盲帖 对称加密 非对称加密
    appid 评价
    使用Carthage安装第三方Swift库
    AngularJS:何时应该使用Directive、Controller、Service?
    xcode7 The operation couldn't be completed.
    cocoapods pod install 安装报错 is not used in any concrete target
    xcode7 NSAppTransportSecurity
    learning uboot how to set ddr parameter in qca4531 cpu
    learning uboot enable protect console
  • 原文地址:https://www.cnblogs.com/zijinguang/p/1368844.html
Copyright © 2011-2022 走看看