菜鸟课堂:适合初学者学习日期操作范例

  • 来源: 赛迪网 作者: fen   2009-08-02/09:08
  • 1.显示本月第一天

    SELECT DATEADD(mm,DATEDIFF(mm,0,getdate()),0)
    select convert(datetime,convert(varchar(8),getdate(),
    120)+'01',120)

    2.显示本月最后一天

    select dateadd(day,-1,convert(datetime,convert
    (varchar(8),dateadd(month,1,getdate()),120)+'01',120))
    SELECT dateadd(ms,-3,DATEADD(mm,DATEDIFF(m,0,getdate())+1,0))

    3.上个月的最后一天

    SELECT dateadd(ms,-3,DATEADD(mm,DATEDIFF(mm,0,getdate()),0))

    4.本月的第一个星期一i

    select DATEADD(wk,DATEDIFF(wk,0, dateadd(dd,6-datepart(
    day,getdate()),getdate())),0
    1000
    )

    5.本年的第一天

    SELECT DATEADD(yy,DATEDIFF(yy,0,getdate()),0)

    6.本年的最后一天

    SELECT dateadd(ms,-3,DATEADD(yy,DATEDIFF(yy,0,getdate())+1,0))

    7.去年的最后一天

    SELECT dateadd(ms,-3,DATEADD(yy,DATEDIFF(yy,0,getdate()),0))

    8.本季度的第一天

    SELECT DATEADD(qq,DATEDIFF(qq,0,getdate()),0)

    9.本周的星期一

    SELECT DATEADD(wk,DATEDIFF(wk,0,getdate()),0)

    10.查询本月的记录

    select * from tableName where DATEPART(mm, theDate)
     =DATEPART(mm, GETDATE()) and DATEPART(yy, theDate) 
    = DATEPART(yy, GETDATE())

    11.查询本周的记录

    select * from tableName where DATEPART(wk, theDate) = DATEPART
    (wk, GETDATE()) and DATEPART(yy, theDate) = DATEPART(yy, GETDATE())

    12查询本季的记录 注:其中:GETDATE()是获得系统时间的函数。

    select * from tableName where DATEPART(qq, theDate) = DATEPART (qq, GETDATE()) and DATEPART(yy, theDate) = DATEPART(yy, GETDATE())

    13.获取当月总天数:

    select DATEDIFF(dd,getdate(),DATEADD
    (mm, 1, getdate()))
    
    select datediff(day,
    dateadd(mm, datediff(mm,'',getdate()), ''),
    dateadd(mm, datediff(mm,'',getdate()), '1900-02-01'))

    14.获取当前为星期几

    DATENAME(weekday, getdate())

    (责任编辑:董建伟)


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