Anderson, Alan R wrote:
Isn't the card type a piece of derived data? You should never have to enter it directly; it's computable from (the first digit(s) of) the card number.Also note, the type of card isn't a SET option at all (it would be an ENUM) and if its used as a foreign-key relation to a table of card types, the card type verification (how to check the digits, etc.) could be stored in the table:
CCTypes
-------
ID ... primary key
Name { entries: "mastercard", "visa", "amex", "diners club", "..." }
VerifyMethod { ... }
--
Michael T. Babcock
C.T.O., FibreSpeed Ltd. ... sql
http://www.fibrespeed.net/~mbabcock
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