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Trigger for Minimum character entry

606396Nov 1 2007 — edited Nov 2 2007
Hello,
I would like to be able to make users enter a minimum number of characters, eg

refno char(4), when they insert data, they can ONLY enter 4 characters, no more no less.

I have been told this can't be done with a check constraint, and I have to a Trigger, but I have no idea where to start!
Cheers, Sam.
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Locked on Nov 30 2007
Added on Nov 1 2007
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