CELKO (8/22/2014)
What do you use for the PK on lookup tables?
I use the encoding that is being used. The IDENTITY property (not a column!) is the count of insertion attempts that was made to that disk on that one machine.
Example: look up table for two-letter state codes using the two letter code as PK. What would IDENTITY mean? How would it improve anything?
Of course for states I would use the code.
How about something like Coupon types? What would you use there? I am certainly not going to use the description of the type (PercentageDiscount, FreeShipping, BOGO, etc).
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