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's a suggestion for getting the first and last days of the week for a month:

-- Build a temp table with all the dates of the month 
drop table #tmp_datesforMonth 
go

declare @begDate datetime
declare @endDate datetime

set @begDate = '6/1/13'
set @endDate = '6/30/13';

WITH N(n) AS  
(   SELECT 0  
        UNION ALL 
    SELECT n+1 
    FROM N 
    WHERE n <= datepart(dd,@enddate)
)
SELECT      DATEADD(dd,n,@BegDate) as dDate 
into #tmp_datesforMonth
FROM        N
WHERE       MONTH(DATEADD(dd,n,@BegDate)) = MONTH(@BegDate)

--- pull results showing the weeks' dates and the week # for the month (not the week # for the current month) 

select  MIN(dDate) as BegOfWeek
, MAX(dDate) as EndOfWeek 
, datediff(week, dateadd(week, datediff(week, 0, dateadd(month, datediff(month, 0, dDate), 0)), 0), dDate) as WeekNumForMonth 
from #tmp_datesforMonth
group by datediff(week, dateadd(week, datediff(week, 0, dateadd(month, datediff(month, 0, dDate), 0)), 0), dDate) 
order by 3, 1