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)
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())