I am wandering about the pros and cons of creating a separate serial field for a primary key when I already have a single unique field. This existing unique field will have to be a character of fixed length (VARCHAR(12)) because although it's a numeric value there will be leading zeroes. There are a couple more tables with similar unique fields and one of them would need to reference the others. Does anybody see any good reason for adding a separate autoincrement primary key field for each table? or either way is not a big deal.
Sally
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