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Updating a Temp Table column with data from another column in same Temp Table (data from previous month)

  • September 6, 2013 at 1:24 pm

    #298547

    Using T-SQL (SS2K8) in a stored procedure, I have created a temp table (#Month) with (Month, Year, Department, Count1, Count2, CurrPerc, and PrevPerc)

    I am trying to update that table with data (CurrPerc) from the previous month in the new column (the previous month's data in PrevPerc)

    UPDATE #Month

    SET [PrevPerc] = [CurrPerc]

    WHERE [MONTH] = (IF [MONTH] = 1 THEN 12 ELSE [MONTH] - 1 END

    WHEN [MONTH] = 1 THEN T.[YEAR] - 1 ELSE T.[YEAR] END

    INNER JOIN #Month P ON [DEPARTMENT] = P.DEPARTMENT

    I know my T-Sql is off, so any help would be great. Thanks!

  • September 6, 2013 at 1:36 pm

    #1648223

    Something like this?

    UPDATE #Month

    SET [PrevPerc] = [CurrPerc],

    [MONTH] = case [MONTH] when 1 THEN 12 ELSE [MONTH] - 1 END,

    [YEAR] = case [MONTH] when 1 THEN T.[YEAR] - 1 ELSE T.[YEAR] END

    If that doesn't get you close enough to figure it out I would recommend you take a few minutes and read the first article in my signature for best practices when posting questions.

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  • September 6, 2013 at 1:58 pm

    #1648230

    Thanks Sean - that populated the PrevPerc column with the data from the CurrPerc (but from the same month). I was hoping to capture the previous month's CurrPerc data.

    It has gotten me closer though... I'll keep at it.

    Jeff

  • September 6, 2013 at 3:18 pm

    #1648253

    UPDATE CurrMonth

    SET [PrevPerc] = PrevMonth.[CurrPerc]

    FROM #Month CurrMonth

    INNER JOIN #Month PrevMonth ON

    PrevMonth.[DEPARTMENT] = CurrMonth.DEPARTMENT AND

    PrevMonth.[YEAR] = CurrMonth.[YEAR] - CASE WHEN CurrMonth.[MONTH] = 1 THEN 1 ELSE 0 END AND

    PrevMonth.[MONTH] = CASE WHEN CurrMonth.[MONTH] = 1 THEN 12 ELSE CurrMonth.[MONTH] - 1 END

    SQL DBA,SQL Server MVP(07, 08, 09) A socialist is someone who will give you the shirt off *someone else's* back.

  • September 6, 2013 at 3:26 pm

    #1648255

    That was it! Thank you so much Scott.

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