Best Practice in Scenario

Question

I am currently trying to accomplish the following:
get the Last Weekstamp for the last 6 Months, the following ilustrates how the end result might look like:
Month   | Weekstamp |
2013-12|  2013-52    |
2014-01|  2014-05    |
.... and so on
I have a auxiliary Table, which has all Weeks in it and allows me to connect to a Calender Table, which in turn has all months, meaning i am able to get all weekstamps per Month,
but how do i get all of the Last Week Numbers for the Last 6 Months ? my idea was a Temporary table of some sor (never used one, am a beginner when it Comes to SQL) which calculates all of the Weekstamps needing to be filtered out per month, and than gives
out only values which i could than use to filter a query which contains all the data i Need.
Anybody have a better idea?
As i said I am just a beginner so i can't really say what the best way would be
Thanks a lot in Advance!

Answer 1

What is the SQL version you use? Here is a code to get month end days and week numbers for past few months
declare @dt datetime=getdate(), @months int=6;
with
L0 AS(SELECT 1 AS c UNION ALL SELECT 1),
L1 AS(SELECT 1 AS c FROM L0 AS A, L0 AS B),
L2 AS(SELECT 1 AS c FROM L1 AS A, L1 AS B),
CTE AS(select Row_number()Over(Order by (SELECT NULL)) NUM from L2),
CTE_MONTHENDS AS(
select num,Dateadd(d,-1,Dateadd(mm,Datediff(m,0,Dateadd(month,1,dateadd(month,-num,@dt))),0)) DT from cte)
select year(dt),datepart(wk,dt) from CTE_MONTHENDS
Satheesh
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