sql server对时间(月、周)的操作转载

---上个月月初第一天
select CONVERT(varchar(12) , DATEADD(mm,DATEDIFF(mm,0,dateadd(mm,-1,getdate())),0), 112 )
---上个月月末最后一天
select CONVERT(varchar(12),dateadd(ms,-3,DATEADD(mm,DATEDIFF(m,0,getdate()),0)), 112 )

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())

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1. select CONVERT(varchar(12) , getdate(), 101 )
    12/28/2007
2. select CONVERT(varchar(12) , getdate(), 102 )
    2007.12.28
3. select CONVERT(varchar(12) , getdate(), 103 )
    28/12/2007
4. select CONVERT(varchar(12) , getdate(), 104 )
    28.12.2007
5. select CONVERT(varchar(12) , getdate(), 105 )
    28-12-2007
6. select CONVERT(varchar(12) , getdate(), 106 )
    28 12 2007
7. select CONVERT(varchar(12) , getdate(), 107 )
    12 28, 2007
8. select CONVERT(varchar(12) , getdate(), 108 )
    10:06:33
9. select CONVERT(varchar(12) , getdate(), 109 )
    12 28 2007 1
10.select CONVERT(varchar(12) , getdate(), 110 )
    12-28-2007
11.select CONVERT(varchar(12) , getdate(), 111 )
    2007/12/28
12.select CONVERT(varchar(12) , getdate(), 112 )
    20071228
13.select CONVERT(varchar(12) , getdate(), 113 )
    28 12 2007 1
14.select CONVERT(varchar(12) , getdate(), 114 )
    10:07:36:623
15.select CONVERT(varchar, getdate(), 120 )
    2007-12-28 10:08:56
16.select replace(replace(replace(CONVERT(varchar, getdate(), 120 ),'-',''),' ',''),':','')
    20071228101012