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How do I calculate this?


How do I calculate this?

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simflex-897410
simflex-897410
Old Hand
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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
Jeff Moden
Jeff Moden
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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.
If you think its expensive to hire a professional to do the job, wait until you hire an amateur. -- Red Adair

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simflex-897410
simflex-897410
Old Hand
Old Hand (307 reputation)Old Hand (307 reputation)Old Hand (307 reputation)Old Hand (307 reputation)Old Hand (307 reputation)Old Hand (307 reputation)Old Hand (307 reputation)Old Hand (307 reputation)

Group: General Forum Members
Points: 307 Visits: 767
Thanks Jeff.
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