Home Forums SQL Server 2008 SQL Server Newbies Using an amemded @From and @To date to get a new result RE: Using an amemded @From and @To date to get a new result

  • March 1, 2013 at 8:34 am

    #1592416

    wafw1971 (3/1/2013)

    Thanks Chris, I have figured it out now:

    Declare @From Datetime

    Declare @To Datetime

    Set @From = '07 Jan 2013'

    Set @To = '18 Mar 2013'

    SELECT Datediff(Week, dateadd(dd, CASE WHEN datepart(weekday, @From) = 1 THEN 0 ELSE 8 - datepart(weekday, @From) END,@From),

    dateadd(dd, CASE WHEN datepart(weekday, @To) = 1 THEN 0 ELSE 1 - datepart(weekday, @To) END,@To))+1

    Be careful with datepart. From BOL:

    "When datepart is week (wk, ww) or weekday (dw), the return value depends on the value that is set by using SET DATEFIRST." The first day of the week is sunday in the US, monday in the UK.

    “Write the query the simplest way. If through testing it becomes clear that the performance is inadequate, consider alternative query forms.” - Gail Shaw

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