Robert Haas <robertmh...@gmail.com> wrote: > You can do: > > SELECT COUNT(*) FROM (SELECT DISTINCT profile.id, profile.name, > profile.age FROM ...) x; Ah, I see what they wanted now. In older versions of PostgreSQL, they might get better performance in some cases by using GROUP BY: SELECT COUNT(*) FROM (SELECT id, name, age FROM profile GROUP BY id, name, age) x; I don't remember offhand what version started considering a hash for DISTINCT. -Kevin
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