數(shù)據(jù)庫:適合初學(xué)者學(xué)習(xí)日期操作范例

1.顯示本月第一天
    SELECT DATEADD(mm,DATEDIFF(mm,0,getdate()),0)
    select convert(datetime,convert(varchar(8),getdate(),
    120)+'01',120)
    2.顯示本月最后一天
    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.上個(gè)月的最后一天　SELECT dateadd(ms,-3,DATEADD(mm,DATEDIFF(mm,0,getdate()),0))
    4.本月的第一個(gè)星期一i
    select DATEADD(wk,DATEDIFF(wk,0, dateadd(dd,6-datepart(
    day,getdate()),getdate())),0)
    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.查詢本月的記錄
    select * from tableName where DATEPART(mm, theDate)
    =DATEPART(mm, GETDATE()) and DATEPART(yy, theDate)
    = DATEPART(yy, GETDATE())
    11.查詢本周的記錄
    select * from tableName where DATEPART(wk, theDate) = DATEPART
    (wk, GETDATE()) and DATEPART(yy, theDate) = DATEPART(yy, GETDATE())
    12查詢本季的記錄 注：其中:GETDATE()是獲得系統(tǒng)時(shí)間的函數(shù)。
    select * from tableName where DATEPART(qq, theDate) = DATEPART
    (qq, GETDATE()) and DATEPART(yy, theDate) = DATEPART(yy, GETDATE())
    13.獲取當(dāng)月總天數(shù):
    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.獲取當(dāng)前為星期幾
    DATENAME(weekday, getdate())