Well... An additional gripe is that this isn't a good feature (standard or not). Oracle doesn't do it. Db2 doesn't do it. I strongly suggest you guys don't do it.
If you wanna do the optimizations under the covers, cool, but I can't imagine how this would be useful other than for saving some typing... Seems more trouble than it's worth and changes a concept that's tried and true for many years. Regards, Anthony -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Tom Lane Sent: Thursday, October 13, 2005 2:50 PM To: Scott Marlowe Cc: Greg Stark; Stephan Szabo; Rick Schumeyer; pgsql-sql@postgresql.org Subject: Re: [SQL] pg, mysql comparison with "group by" clause >>>> In standard SQL you have to >>>> write GROUP BY ... and list every single column you need from the master >>>> table. This thread seems to have gone off on a tangent that depends on the assumption that the above is a correct statement. It's not. It *was* true, in SQL92, but SQL99 lets you omit unnecessary GROUP BY columns. The gripe against mysql, I think, is that they don't enforce the conditions that guarantee the query will give a unique result. The gripe against postgres is that we haven't implemented the SQL99 semantics yet. regards, tom lane ---------------------------(end of broadcast)--------------------------- TIP 4: Have you searched our list archives? http://archives.postgresql.org ---------------------------(end of broadcast)--------------------------- TIP 3: Have you checked our extensive FAQ? http://www.postgresql.org/docs/faq