A practical example of date operations in SQL Server 2000

1. display the first day of the month

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

2. display the last day of the month

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. Last day of last month

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

4. the first Monday of this month

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

5. The first day of this year

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

6. The last day of the year

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

7. Last day of last year

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

8. The first day of this quarter

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

9. Monday of the week

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

10. query records of this month

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

11. query the records of this week

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

12. query this season's recordsNote: getdate () is a function used to obtain the system time.

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

13. Get the total number of days of the month:

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. Obtain the current day of the week

DATENAME(weekday, getdate())