操作日期的SQL語句大全：
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.顯示本月最後一天
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.上個月的最後一天
SELECT dateadd(ms,-3,DATEADD(mm,DATEDIFF(mm,0,getdate()),0))
4.本月的第一個星期一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.本年的最後一天
SELECT dateadd(ms,-3,DATEADD(yy,DATEDIFF(yy,0,getdate())+1,0))
7.去年的最後一天
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()是獲得系統時間的函數。
select * from tableName where DATEPART(qq, theDate) = DATEPART
(qq, GETDATE()) and DATEPART(yy, theDate) = DATEPART(yy, GETDATE())
13.獲取當月總天數:
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.獲取當前為星期幾
DATENAME(weekday, getdate())
