On Mon, 2004-11-22 at 16:54 -0800, Josh Berkus wrote: > Alexandre, > > > What is the common approach? Should I use directly the product_code as > > my ID, or use a sequantial number for speed? (I did the same for the > > company_id, this is a 'serial' and not the shor name of the customer. > > I just don't know what is usually done. > > Don't use SERIAL just because it's there. Ideally, you *want* to use the > product_code if you can. It's your natural key and a natural key is always > superior to a surrogate key all other things being equal. It would be nice if PostgreSQL had some form of transparent surrogate keying in the background which would automatically run around and replace your real data with SERIAL integers. It could use a lookup table for conversions between the surrogate and real values so the user never knows that it's done, a bit like ENUM. Then we could all use the real values with no performance issues for 1) because it's an integer in the background, and 2) because a cascade only touches a single tuple in the lookup table. --
