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How do I calculate this?

  • May 27, 2013 at 6:15 pm

    #147846

    I have a table called locations with fieldnames:

    locationId --determines the location of trainee

    locationName --name of the location training

    maxSeat --total number of seats allowed at that location.

    available_seats -- (MaxSeat - registered trainees)

    My question is:

    We would like to a button that says "Register" to substract a number from MaxSeat and "Cancel" to put back a number to MaxSeat.

    In other words, when a potential trainee registers for a class, we would like to substract a number from maxSeat.

    For instance, maxSeat is 45. If a trainee registers for that class, we would substract 1 from maxSeat.

    Example: if maxSeat is 45 and a new trainee registers, we would like to see available seat as 44.

    If another trainee registers, available seat should read 43, etc.

    If a trainee decides to cancel a seat, this puts back a seat to availlable_seat so that it now goes up by one.

    How can I code this?

    Thanks a lot

  • May 27, 2013 at 11:22 pm

    #1618851

    Create another value somewhere that is a copy of the MAX. Increment and decrement that with the idea that "returns" will never drive the number over the MAX and "draws" will ever decremet the number below 0.

    --Jeff Moden

    RBAR is pronounced "ree-bar" and is a "Modenism" for Row-By-Agonizing-Row.
    First step towards the paradigm shift of writing Set Based code:
    ________Stop thinking about what you want to do to a ROW... think, instead, of what you want to do to a COLUMN.

    Change is inevitable... Change for the better is not.

    Helpful Links:
    How to post code problems
    How to Post Performance Problems
    Create a Tally Function (fnTally)

  • May 28, 2013 at 6:50 am

    #1618933

    Thanks Jeff.

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