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 how do i find 5th working day in a month. Rate Topic Display Mode Topic Options
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 Posted Tuesday, October 29, 2013 11:54 PM
 Grasshopper Group: General Forum Members Last Login: Wednesday, October 30, 2013 3:02 AM Points: 13, Visits: 56
 Hi Experts,i would like to know how to find fifth workingday* of a given month and year.workingday - working day is just any day apart from saturday and sunday. no need to consider any other holidays.ex: I would just give month number and year as input and i would like to know date and day of the fifth working day.Input : 10/2013Output : 7th October 2013, Monday.any help would be appreciated.Thank youKishore.
Post #1509659
 Posted Wednesday, October 30, 2013 2:40 AM
 SSChampion Group: General Forum Members Last Login: Yesterday @ 12:50 PM Points: 11,190, Visits: 8,035
 `SET DATEFIRST 1; -- first day of the week is a MondayDECLARE @month INT = 10;DECLARE @year INT = 2013;-- Tally table of 7 rowsWITH CTE_Tally AS( SELECT 0 AS Number UNION ALL SELECT 1 UNION ALL SELECT 2 UNION ALL SELECT 3 UNION ALL SELECT 4 UNION ALL SELECT 5 UNION ALL SELECT 6)SELECT resultdate = datesFROM ( SELECT dates, RID = ROW_NUMBER() OVER (ORDER BY dates) FROM ( SELECT dates = DATEADD(dd,Number,DATEFROMPARTS(@year,@month,1)) FROM CTE_Tally ) tmp WHERE DATEPART(weekday,dates) NOT IN (6,7) -- filter out saturday and sunday ) tmp2WHERE RID = 5;`I used the function DATEFROMPARTS, which is only available from SQL Server 2012. Since you posted this question in a SQL 2014 forum, I assume that won't be a problem. How to post forum questions.Need an answer? No, you need a question.What’s the deal with Excel & SSIS?Member of LinkedIn. My blog at LessThanDot. MCSA SQL Server 2012 - MCSE Business Intelligence
Post #1509681
 Posted Wednesday, October 30, 2013 3:03 AM
 Grasshopper Group: General Forum Members Last Login: Wednesday, October 30, 2013 3:02 AM Points: 13, Visits: 56
 Thanks a ton Koen.it worked.
Post #1509689
 Posted Wednesday, October 30, 2013 8:37 PM
 SSC-Dedicated Group: General Forum Members Last Login: Today @ 4:43 AM Points: 34,537, Visits: 28,702
 As much as I love Tally Tables and as high performing as they can be, I find that pure math will frequently beat it (although I've not tested it in this case). This includes a "short circuit" for Tuesday thru Saturday (since we're not considering holidays, the 5th workday is ALWAYS the 7th of the month if the month starts on any of those days). The FROM clause in the following is the good ol' fashioned, backwards compatible way of converting separate INTs for Month and Year to a DATETIME for the first of that month. The number 22801 is 1900*12 months + 1 to get rid of the current month.I've also made it so the code is not dependent on the value of DATEFIRST so that this can easily be incorporated into a high performance iSF (Inline Scalar Function which is really an Inline Table Valued Function that returns a single value).`DECLARE @pMonth INT ,@pYear INT; SELECT @pMonth = 11 ,@pYear = 2013; SELECT FifthWeekDay = DATEADD(dd, CASE WHEN DATEDIFF(dd,-1,ca.FirstOfMonth)%7 > 1 -- -1 is a Sunday THEN 7 ELSE 6-DATEDIFF(dd,-1,ca.FirstOfMonth)%7 -- -1 is a Sunday END ,ca.FirstOfMonth-1) FROM (SELECT DATEADD(mm,@pYear*12-22801+@pMonth,0))ca(FirstOfMonth);`Someone with more caffeine in their system might be able to simplify this even more. --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." "Change is inevitable. Change for the better is not." -- 04 August 2013(play on words) "Just because you CAN do something in T-SQL, doesn't mean you SHOULDN'T." --22 Aug 2013Helpful Links:How to post code problemsHow to post performance problems
Post #1510005
 Posted Wednesday, October 30, 2013 9:05 PM
 SSC-Dedicated Group: General Forum Members Last Login: Today @ 4:43 AM Points: 34,537, Visits: 28,702
 If you only need compatibility back to 2005, then I guess you could call the following a "simplification".`DECLARE @pMonth INT ,@pYear INT ,@Date DATETIME; SELECT @pMonth = 11 ,@pYear = 2013; SELECT FifthWeekDay = DATEADD(dd, CASE WHEN d.DoW > 1 THEN 7 ELSE 6-d.DoW END, f.FirstOfMonth-1) FROM (SELECT DATEADD(mm,@pYear*12-22801+@pMonth,0)) f (FirstOfMonth) CROSS APPLY (SELECT DATEDIFF(dd,-1,f.FirstOfMonth)%7) d (DoW);` --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." "Change is inevitable. Change for the better is not." -- 04 August 2013(play on words) "Just because you CAN do something in T-SQL, doesn't mean you SHOULDN'T." --22 Aug 2013Helpful Links:How to post code problemsHow to post performance problems
Post #1510010

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