In response to "Robins Tharakan" <tharakan@xxxxxxxxx>: > Hi, > > I have been reading this conversation for a few days now and I just wanted > to ask this. From the release notes, one of the new additions in 8.3 is > (Allow col IS NULL to use an index (Teodor)). > > Sorry, if I am missing something here, but shouldn't something like this > allow us to get a (fast) accurate count ? > > SELECT COUNT(*) from table WHERE indexed_field IS NULL > + > SELECT COUNT(*) from table WHERE indexed_field IS NOT NULL For certain, qualified definitions of "fast", sure. -- Bill Moran Collaborative Fusion Inc. http://people.collaborativefusion.com/~wmoran/ wmoran@xxxxxxxxxxxxxxxxxxxxxxx Phone: 412-422-3463x4023 **************************************************************** IMPORTANT: This message contains confidential information and is intended only for the individual named. If the reader of this message is not an intended recipient (or the individual responsible for the delivery of this message to an intended recipient), please be advised that any re-use, dissemination, distribution or copying of this message is prohibited. Please notify the sender immediately by e-mail if you have received this e-mail by mistake and delete this e-mail from your system. E-mail transmission cannot be guaranteed to be secure or error-free as information could be intercepted, corrupted, lost, destroyed, arrive late or incomplete, or contain viruses. The sender therefore does not accept liability for any errors or omissions in the contents of this message, which arise as a result of e-mail transmission. **************************************************************** -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
