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How do I calculate this?


How do I calculate this?

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simflex-897410
simflex-897410
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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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Points: 45215 Visits: 39926
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.
Although they tell us that they want it real bad, our primary goal is to ensure that we dont actually give it to them that way.
Although change is inevitable, change for the better is not.
Just because you can do something in PowerShell, doesnt mean you should. Wink

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simflex-897410
simflex-897410
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Thanks Jeff.
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