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On Tue, 2004-11-09 at 15:28, Tony Carolla wrote: > Thanks Rich. > > My second attempt (which I didn't tell about -- I was trying to avoid > a novel ;) did just that. I made a discovery though, that over 50% of > people have the same ss# -- Zero. Right, the SS index should not include records where the SS is 0, 0 means not given. Course on the systems I work on, the SS is required, so the bogus records have a SS# = 1. Anyway, simply create the SS logical with a select/omit criteria, and only select those records that have an SS. Same for birthdate, btw. I think you will be able to save *many* I/O's and much processing time by using the three indexes idea. -- Regards, Rich Current Conditions in Des Moines, IA Broken Clouds Temp 62.6F Winds out of the Southwest at 16mph
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