Home Forums SQL Server 7,2000 T-SQL how to ignore null columns RE: how to ignore null columns

  • February 27, 2013 at 1:19 pm

    #1591712

    great job on giving us the setup DDL and Data.

    Your data has all the same datetimes, so it'll probably look better when you compare the example with real data.

    this seems to work for me, is this what you are after?

    SELECT

    ID,

    PO,

    CASE WHEN ISNULL(timestamp1,'1900-01-01') >= ISNULL(timestamp2,'1900-01-01')

    AND ISNULL(timestamp1,'1900-01-01') >= ISNULL(timestamp3,'1900-01-01')

    AND ISNULL(timestamp1,'1900-01-01') >= ISNULL(timestamp4,'1900-01-01')

    THEN ISNULL(timestamp1,'1900-01-01')

    WHEN ISNULL(timestamp2,'1900-01-01') >= ISNULL(timestamp1,'1900-01-01')

    AND ISNULL(timestamp2,'1900-01-01') >= ISNULL(timestamp3,'1900-01-01')

    AND ISNULL(timestamp2,'1900-01-01') >= ISNULL(timestamp4,'1900-01-01')

    THEN ISNULL(timestamp2,'1900-01-01')

    WHEN ISNULL(timestamp3,'1900-01-01') >= ISNULL(timestamp1,'1900-01-01')

    AND ISNULL(timestamp3,'1900-01-01') >= ISNULL(timestamp2,'1900-01-01')

    AND ISNULL(timestamp3,'1900-01-01') >= ISNULL(timestamp4,'1900-01-01')

    THEN ISNULL(timestamp3,'1900-01-01')

    WHEN ISNULL(timestamp4,'1900-01-01') >= ISNULL(timestamp1,'1900-01-01')

    AND ISNULL(timestamp4,'1900-01-01') >= ISNULL(timestamp2,'1900-01-01')

    AND ISNULL(timestamp4,'1900-01-01') >= ISNULL(timestamp3,'1900-01-01')

    THEN ISNULL(timestamp4,'1900-01-01')

    END As MaxDate

    FROM [Dates]

    Lowell

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