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Bonus TIPS for Successful Posting

Try a Search First
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SQL Query Filtering

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    SQL Query Filtering

    I need some help with an SQL Query for filtering a grid. The grid shows by vendor prices, the table is setup

    SupplyPoint
    Supplier
    Product
    EffectiveDate
    EffectiveTime
    Price

    I have got my query setup that limits my grid to all prices before a certain date and time that the user enters through arguments. What I need help with is to further limit the grid to the current price which would be the first price prior to the entered date and time for each combination of SupplyPoint, Supplier, Product. I think I need to use a Group by statement but not sure how I get just the first price before the entered date and time.

    #2
    Re: SQL Query Filtering

    Originally posted by cawright View Post
    I need some help with an SQL Query for filtering a grid. The grid shows by vendor prices, the table is setup

    SupplyPoint
    Supplier
    Product
    EffectiveDate
    EffectiveTime
    Price

    I have got my query setup that limits my grid to all prices before a certain date and time that the user enters through arguments. What I need help with is to further limit the grid to the current price which would be the first price prior to the entered date and time for each combination of SupplyPoint, Supplier, Product. I think I need to use a Group by statement but not sure how I get just the first price before the entered date and time.
    SELECT * FROM tbl WHERE price IN (SELECT price FROM tbl alias2 WHERE EffectiveDate<:date ORDER By EffectiveDate DESC LIMIT 1)

    Its not a 100% solution - Im not sure why you're storing EffectiveDate and Time seperately - you can just store these as a DATETIME variable.
    The above statement doesnt take the time into consideration - you would have to concat then cast to datetime.
    But above is sort of what you want and should at least give you an idea of the direction you need to take it.
    Scott Moniz - Computer Programmer/Analyst
    REA Inc.
    http://reainc.net
    (416)-533-3777
    [email protected]

    REA INC offers consulting services, programming services, systems design, database design, third party payment gateway integration (CHASE, PAYPAL, AUTHORIZE.NET) and developer support.
    If you need custom code, or 1-to-1 mentoring in any facet of your database/web application design,
    contact us to discuss options.

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