On Tuesday 26 Nov 2002 1:14 pm, Zuev Dmitry wrote: > Suppose you have a table T: > > A B > 1 '111' > 2 '222' > > How do you select A and B of the record with A maximum?
> 1) SELECT A, B FROM T ORDER BY A DESC LIMIT 1 > > 2) SELECT A, B FROM T WHERE A IN (SELECT MAX(A) FROM T) > > What do yo think of the queries above? And give me the better > implementation if possible. If you have an index on A the first option will be faster. All PG has to do in this case is check the end of the index and fetch one row. -- Richard Huxton ---------------------------(end of broadcast)--------------------------- TIP 5: Have you checked our extensive FAQ? http://www.postgresql.org/users-lounge/docs/faq.html
