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How would I get mysql to generate a 4 digit number and never use it again

GD_GRAY asked
Last Modified: 2013-12-12
How would I get mysql to generate a 4 digit number and never use it again if it finds it in the db.I need to auto put an invoice number into a form so that once the form is posted into the data base I can run queries for the data on that invoice. I use a random number java script right now but sooner or later its going to bonk on me. The field for the invoice number is set to unique so when that happens its going to stop the insert statement and the user will have to start over... Not good I thought maybe a table full of 4 digit numbers for it to pull from but I don't know how to mark it as used so it wont get the same one twice.
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