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Date spans

  • July 22, 2010 at 2:44 pm

    #221631

    I'm at a point beyond my coding abilities.

    I have a table with thousands of members and their effective and end enrollment dates. I need to find which where continuously enrolled with less than 30 day gap between last end date and new enroll day and then for those not continously enrolled I need the latest membership span.

    Someone mentioned using cursors but I have not idea what they are talking about.

    Example

    Pt not continuously enrolled (need last continuous date span)

    Pt Nbr Eff Date end date

    49700 2006120120090930 --

    497002009120120091231

    497002010010120100531

    pt continuously enrolled ( no gap in enrollment)

    Pt Nbr Eff Date end date

    497022007120120071231

    4970220080101

    Any help would be appreciated.:crazy:

  • July 22, 2010 at 3:02 pm

    #1197208

    I'd probably use a CTE(common table expression)/subquery with ROW_NUMBER() and a self join to it. Then I would check for DATEDIFF(dd, cte1.enddate, cte2.EffDate)<30.

    If you'd like to see a coded example please provide table definition, sample data and expected result in a ready to use format as described in the first link in my signature.


    Lutz
    A pessimist is an optimist with experience.

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