On Feb 13, 2006, at 14:23, Ann W. Harrison wrote:

> Either is exactly a full table scan if the field is never null, but
> less than that if the field can be null.

Thanks!
________________________________________________________
Richard Wesley Software Engineer
Tableau Software
(w) +1-206-633-3400x505
hawkfish@...
http://www.tableausoftware.com/



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