There are perfectly valid reasons for querying a table when no rows are expected to be returned.
create table x as select * from y where 1=2; ... comes to mind. Jared On Thursday 03 April 2003 15:58, AK wrote: > If I execute a query like , > select count(*) from some_table where 1=2 . > why does oracle bothers to look at tables . Since there is only one > condition which is false . > > If I write a sql like > > select count(*) > from some_table > where column_a= :a > and a is not null; > > it should not even go to look at table , but explain plan suggests that it > does a index /table scan . > > -ak ---------------------------------------- Content-Type: text/html; charset="iso-8859-1"; name="Attachment: 1" Content-Transfer-Encoding: quoted-printable Content-Description: ---------------------------------------- -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Jared Still INET: [EMAIL PROTECTED] Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
