How to get week number of the month from the date in sql server 2008

Question

In SQL Statement in microsoft sql server, there is a built-in function to get week number but it is the week of the year.

Select DatePart(week, \'2012/11/30\         


        

Answer 1

Here is the query that brings the week number on whatever the startday and endday of the week it may be.

SET DATEFIRST 2    

DECLARE @FROMDATE DATE='12-JAN-2015'
-- Get the first day of month
DECLARE @ALLDATE DATE=DATEADD(month, DATEDIFF(month, 0, @FROMDATE), 0)
DECLARE @FIRSTDATE DATE


;WITH  CTE as
(
     -- Get all dates in that month
     SELECT 1 RNO,CAST(@ALLDATE AS DATE) as DATES 
     UNION ALL
     SELECT RNO+1, DATEADD(DAY,1,DATES )
     FROM    CTE
     WHERE   DATES < DATEADD(MONTH,1,@ALLDATE)
)
-- Retrieves the first day of week, ie, if first day of week is Tuesday, it selects first Tuesday 
SELECT TOP 1 @FIRSTDATE =   DATES 
FROM    CTE 
WHERE DATEPART(W,DATES)=1

SELECT (DATEDIFF(DAY,@FIRSTDATE,@FROMDATE)/7)+1 WEEKNO

For more information I have answered for the below question. Can check that.

• How do I find week number of a date according to DATEFIRST