Comments on: Back to basics: anti-joins and semi-joins http://awads.net/wp/2007/05/01/back-to-basics-anti-joins-and-semi-joins/ News, views, tips and tricks on Oracle and other fun stuff Fri, 21 Nov 2008 03:25:02 +0000 http://wordpress.org/?v=2.6.3 By: Eddie Awad http://awads.net/wp/2007/05/01/back-to-basics-anti-joins-and-semi-joins/#comment-50735 Eddie Awad Wed, 02 May 2007 19:54:28 +0000 http://awads.net/wp/2007/05/01/back-to-basics-anti-joins-and-semi-joins/#comment-50735 <p>Thanks for this tip Eric. Very interesting and good to know. One would think that "ANSI SQL" and "Oracle SQL" <em>should</em> behave the same in Oracle. So, This gotcha looks like an Oracle bug to me.</p> Thanks for this tip Eric. Very interesting and good to know. One would think that “ANSI SQL” and “Oracle SQL” should behave the same in Oracle. So, This gotcha looks like an Oracle bug to me.

]]> By: Eric http://awads.net/wp/2007/05/01/back-to-basics-anti-joins-and-semi-joins/#comment-50734 Eric Wed, 02 May 2007 14:51:02 +0000 http://awads.net/wp/2007/05/01/back-to-basics-anti-joins-and-semi-joins/#comment-50734 <p>A great set of articles on joins, however, there is a big GOTCHA! waiting for Oracle developers adopting ANSI joins:</p> <p>If you are writing queries that select from many tables, like denormalizing data for warehousing, and the sum of the columns in those tables exceeds 1,050, you'll always get ORA-01445.</p> <p>This occurs from 9i through 10g2, and has happened often enough to me that I avoid my preference for ANSI syntax on Oracle databases, unless I'm just selecting from a few tables.</p> <p>Just something to watch out for.</p> <p>thanks again for the articles!</p> A great set of articles on joins, however, there is a big GOTCHA! waiting for Oracle developers adopting ANSI joins:

If you are writing queries that select from many tables, like denormalizing data for warehousing, and the sum of the columns in those tables exceeds 1,050, you’ll always get ORA-01445.

This occurs from 9i through 10g2, and has happened often enough to me that I avoid my preference for ANSI syntax on Oracle databases, unless I’m just selecting from a few tables.

Just something to watch out for.

thanks again for the articles!

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