Comments on: Oracle SQL tip http://awads.net/wp/2005/11/29/oracle-sql-tip/ News, views, tips and tricks on Oracle and other fun stuff Tue, 07 Oct 2008 06:59:51 +0000 http://wordpress.org/?v=2.5 By: ronald http://awads.net/wp/2005/11/29/oracle-sql-tip/#comment-346 ronald Wed, 30 Nov 2005 06:50:32 +0000 http://awads.net/wp/?p=166#comment-346 <p>This is indeed handy when you cannot create an index, thanks!</p> This is indeed handy when you cannot create an index, thanks!

]]> By: Eddie Awad http://awads.net/wp/2005/11/29/oracle-sql-tip/#comment-345 Eddie Awad Tue, 29 Nov 2005 17:27:04 +0000 http://awads.net/wp/?p=166#comment-345 <p>Matt, you could. In fact, in the example above, if I do not have access to the query (I cannot change it for whatever reason), a FBI would be appropriate (if an index is needed). </p> <p>However, if I am the one who is writing a query (such as the one above) or if I can change an existing query, then I would definitely use the <code>trunc(date) + .99999</code> trick (knowing that the date column is already indexed). It is simpler than a FBI because I do not have to create yet another database object (the FBI) and I do not need to have all the <a href="http://download-west.oracle.com/docs/cd/B10501_01/server.920/a96540/statements_510a.htm#2062463" rel="nofollow">prerequisites</a> for creating a FBI (QUERY REWRITE for example), not to mention that in certain environments, issuing a DDL may involve a DBA, not that it is a bad thing, rather than it may take longer time to get things done.</p> Matt, you could. In fact, in the example above, if I do not have access to the query (I cannot change it for whatever reason), a FBI would be appropriate (if an index is needed).

However, if I am the one who is writing a query (such as the one above) or if I can change an existing query, then I would definitely use the trunc(date) + .99999 trick (knowing that the date column is already indexed). It is simpler than a FBI because I do not have to create yet another database object (the FBI) and I do not need to have all the prerequisites for creating a FBI (QUERY REWRITE for example), not to mention that in certain environments, issuing a DDL may involve a DBA, not that it is a bad thing, rather than it may take longer time to get things done.

]]> By: Matt Ball http://awads.net/wp/2005/11/29/oracle-sql-tip/#comment-344 Matt Ball Tue, 29 Nov 2005 16:44:37 +0000 http://awads.net/wp/?p=166#comment-344 <p>Couldn't you just create a function based index</p> Couldn’t you just create a function based index

]]>