Comments on: The Rule Challenge http://blog.rhodiumtoad.org.uk/2010/06/21/the-rule-challenge/ an experimental blog Sun, 05 Feb 2012 15:07:28 +0000 http://wordpress.org/?v=2.2.1 By: Andrew http://blog.rhodiumtoad.org.uk/2010/06/21/the-rule-challenge/#comment-8750 Andrew Tue, 22 Jun 2010 17:36:48 +0000 http://blog.rhodiumtoad.org.uk/2010/06/21/the-rule-challenge/#comment-8750 We've had more than the usual number of rules questions on IRC recently, at least that's my impression; that would probably explain the multiple recent blog posts. (And I only wrote this one because someone on IRC bugged me about it.) We’ve had more than the usual number of rules questions on IRC recently, at least that’s my impression; that would probably explain the multiple recent blog posts. (And I only wrote this one because someone on IRC bugged me about it.)

]]> By: Robert Young http://blog.rhodiumtoad.org.uk/2010/06/21/the-rule-challenge/#comment-8735 Robert Young Tue, 22 Jun 2010 12:30:56 +0000 http://blog.rhodiumtoad.org.uk/2010/06/21/the-rule-challenge/#comment-8735 I'm not principally a PostgreSQL folk, DB2 is my main squeeze, but I do follow it a bit. The whole rules thing is something only PG did, and that was Stonebraker's doing. One would have to read up his rationale way back when. From what I can find, View support is the justification for using rules, since that is the only way to get it. There have been a few links from the PostgreSQL site to rule posts such as this recently. I wonder why rules have become a topic du jour? The challenge as written isn't provable; the counterexample is exhaustive enumeration of all non-trivial rules. As to better, one of those linked posts asserts that triggers are better. I would agree with that. I’m not principally a PostgreSQL folk, DB2 is my main squeeze, but I do follow it a bit. The whole rules thing is something only PG did, and that was Stonebraker’s doing. One would have to read up his rationale way back when. From what I can find, View support is the justification for using rules, since that is the only way to get it. There have been a few links from the PostgreSQL site to rule posts such as this recently. I wonder why rules have become a topic du jour?

The challenge as written isn’t provable; the counterexample is exhaustive enumeration of all non-trivial rules.

As to better, one of those linked posts asserts that triggers are better. I would agree with that.

]]> By: Andrew http://blog.rhodiumtoad.org.uk/2010/06/21/the-rule-challenge/#comment-8710 Andrew Tue, 22 Jun 2010 04:41:57 +0000 http://blog.rhodiumtoad.org.uk/2010/06/21/the-rule-challenge/#comment-8710 That is indeed the real question, but it's one for another blog post rather than this one :-) That is indeed the real question, but it’s one for another blog post rather than this one :-)

]]> By: Tom Lane http://blog.rhodiumtoad.org.uk/2010/06/21/the-rule-challenge/#comment-8706 Tom Lane Tue, 22 Jun 2010 03:43:46 +0000 http://blog.rhodiumtoad.org.uk/2010/06/21/the-rule-challenge/#comment-8706 Rules work all right for views (ie, ON SELECT DO INSTEAD SELECT cases). There's no question that every other case sucks. The *real* question is how to do better? Rules work all right for views (ie, ON SELECT DO INSTEAD SELECT cases). There’s no question that every other case sucks. The *real* question is how to do better?

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