Week numbers and week start dates

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Week numbers and week start dates

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balars_2000

Posted Tuesday, June 09, 2009 12:14 AM

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Hi Folks,
Can you help me out with this?

I have a report that displays the week # and start of the week date and sums up revenue collected for the period.
For example, if I choose current year, Week # would start as 1 and start of the week should be 5/01 (first Monday of the year) and so on till current week which is 24 and week date is 08/06.

Thanks.

Post #731156

t.hitendra

Posted Tuesday, June 09, 2009 12:58 AM

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Hi there,

I have tried to write a query for your problem with this sample table, tblPurchaseOrder - PurchaseOrderDate & GrandTotal

here it is-

select weekno,newdate,sum(grandtotal) as grandtotal from
(select datepart(wk,purchaseorderdate) as weekno
,dateadd(dd,0,datediff(dd,0,purchaseorderdate-(datepart(weekday,purchaseorderdate)-1)+1)) as newdate,grandtotal
from tblpurchaseorder where purchaseorderdate<=getdate()) as tbl group by weekno,newdate

Here I have subtracted 1 from (weekday,purchaseorderdate) to
make it start from monday (default for monday will be 2).

and the whole equation gives monday of that week.

please try it and tell me if that is what you need.

Post #731183

balars_2000

Posted Tuesday, June 09, 2009 7:26 PM

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hi mate
thanks for ur response; appreciate it.
sorry if i wasnt clear, i need week numbers and week start dates for any given date range or a year. if it was a year, for example 2009, the output would be

week # week start date
1 05/01
2 12/01
3 19/01

and so on till current date. if it was for a date range for example between 19/01 and 2/02 (for 2009) then it should be
week # week start date
1 19/01
2 26/01
3 02/02

thanks again for ur time :)

Post #731980

Jeff Moden

Posted Tuesday, June 09, 2009 8:56 PM

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balars_2000 (6/9/2009)

What do you want if data is missing for a whole week during the year?

--Jeff Moden

"RBAR is pronounced "ree-bar" and is a "Modenism" for "Row-By-Agonizing-Row".

First step towards the paradigm shift of writing Set Based code:
Stop thinking about what you want to do to a row... think, instead, of what you want to do to a column."

For better, quicker answers on T-SQL questions, click on the following...
http://www.sqlservercentral.com/articles/Best+Practices/61537/

For better answers on performance questions, click on the following...
http://www.sqlservercentral.com/articles/SQLServerCentral/66909/

Post #732000

balars_2000

Posted Tuesday, June 09, 2009 9:33 PM

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I would display 0's to indicate there was no data during that particular week.

--Ta

Post #732012

Jeff Moden

Posted Tuesday, June 09, 2009 10:34 PM

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balars_2000 (6/9/2009)

I would display 0's to indicate there was no data during that particular week.

--Ta

Then you need a complete list of dates to join against for any given year...

DECLARE @FirstDate DATETIME
SELECT @FirstDate = '20090104'

SELECT v.Number AS Week,
        DATEADD(wk, v.Number   ,@FirstDate) AS StartDate,
        DATEADD(wk, v.Number+1 ,@FirstDate) AS NextDate
   FROM Master.dbo.spt_Values v
  WHERE Type = 'P'
    AND Number BETWEEN 0 AND 51

--Jeff Moden

Post #732023

balars_2000

Posted Wednesday, June 10, 2009 8:06 PM

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thanks jeff.

Post #732712

balars_2000

Posted Wednesday, June 10, 2009 8:07 PM

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hi hitendar
any comments?

cheers

Post #732713

Jeff Moden

Posted Wednesday, June 10, 2009 8:39 PM

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balars_2000 (6/10/2009)

thanks jeff.

You bet. Thanks for the feedback. So, are you all set or do you have a remaining question?

--Jeff Moden

Post #732719

balars_2000

Posted Wednesday, June 10, 2009 11:38 PM

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Jeff, I have a problem.
The query is working fine and listing all week numbers and dates.
However, I am interested in week day starting Mondays which is 05/01 for current year and subsequently 12/01, 19/01 etc..
Alternatively I should also be able to specify a date range and get the week start from there as well.

I have posted in detail in my previous messages.

Thanks for asking :)

Cheers

Post #732762

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