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 Transact-SQL (2008)
 List events per week (solved)
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Ironic
Starting Member

Portugal
3 Posts

Posted - 11/25/2012 :  03:27:07  Show Profile  Reply with Quote
I have a list of events, each with a date.
What i want is to see how many events happened per week last year.

I think i can use BETWEEN two dates and COUNT number of events.
I was planning on GETDATE(), subtract a year, and add 0 to 51 weeks to get all the weeks. However i heard that loops are frowned upon in SQL.
Is there an alternative way of doing it?

Regards

Edited by - Ironic on 11/25/2012 16:27:55

Luuk123
Yak Posting Veteran

52 Posts

Posted - 11/25/2012 :  07:07:36  Show Profile  Reply with Quote
You can use the DATEPART function like this:

select count(*), Datepart(week , modifieddate)
From Production.Document
group by Datepart(week , modifieddate)
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Elizabeth B. Darcy
Starting Member

United Kingdom
39 Posts

Posted - 11/25/2012 :  08:32:18  Show Profile  Reply with Quote
If you want to restrict the query to one year, include a WHERE clause as shown below.
SELECT COUNT(*) AS NumberOfEvents,
       DATEPART(week, modifieddate) AS [WeekNumber]
FROM   Production.Document
WHERE modifieddate > CAST(DATEADD(yy,-1,GETDATE()) AS DATE)
GROUP BY
       DATEPART(week, modifieddate)


One other thing I must mention is that the result you get would be dependent on the datefirst setting of the session where the query is run (which defaults to the datefirst setting of the server if not explicitly set). If that is a consideration, there are other ways to get the results in a consistent manner, but if it is not, forget that I even said this.


________________________________________
-- Yes, I am indeed a fictional character.

Edited by - Elizabeth B. Darcy on 11/25/2012 08:58:25
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Ironic
Starting Member

Portugal
3 Posts

Posted - 11/25/2012 :  16:27:11  Show Profile  Reply with Quote
Tks for the tips. i got it now
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