On 2006-01-24, Will Glynn <wglynn@xxxxxxxxxxxxxxxxxxxxx> wrote: > You might try: > > SELECT some_column > FROM some_table > GROUP BY some_column > HAVING SUM(CASE WHEN sort_order=1 THEN 1 ELSE 0 END) = 0; SELECT some_column FROM some_table GROUP BY some_column HAVING every(sort_order <> 1); every() is in 8.1 at least (can't recall when it was introduced); it's the same as bool_and(), i.e. an aggregate that returns true only if all inputs are true. Why isn't there a corresponding any(), I wonder? (bool_or does exist) It should be possible to define bool_and() or every() in the usual way as a custom aggregate even on versions that don't have them builtin. -- Andrew, Supernews http://www.supernews.com - individual and corporate NNTP services
