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NEWBIE - Need expression to pull newest record only

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  • NEWBIE - Need expression to pull newest record only

    We have a client table and a table containing client table containing client orders. They are linked by SSN into a set. (such as: Client #1 has had 20 different orders over the course of 10 years, Client #2 has had 15 different orders in 5 years, etc.) I want to send out some marketing to any client that has not had an order in the last 3 months. I can not figure out how to tell the database to only pull the client's last order/(record). I tried making a new set using the one-to-one option, but it still pulls every client that had an order more than three months ago regardless if they have a current order or not. I can't filter out clients with more recent orders because each order is listed as an individual record... Any suggestions?

  • #2
    Re: NEWBIE - Need expression to pull newest record only

    That may be something you need to do by processing the client order table first. Then have a set one to one with client orders as the parent.

    Processing the client order table would consist of

    open the table
    set the order to ssn +invert(cdate(order_date_field))
    fetch the first record and get the ssn into a variable
    while the last record is not fetched
    if the date is > addmonths(date(),-3)
    do nothing and fetch records while the ssn is the same
    else
    mark the record and fetch records while the ssn is the same
    end the if loop
    fetch the next record
    end the while loop

    Then query the "upside down" set for marked records.
    There can be only one.

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