PostgreSQL Blog Hans-Juergen Schoenig http://www.postgresql-support.de/blog/blog_hans.html This is the PostgreSQL Blog of Hans-Juergen Schoenig. Feeder 1.4.10(222) http://reinventedsoftware.com/feeder/ http://blogs.law.harvard.edu/tech/rss en Fri, 25 Jan 2008 13:59:10 +0100 Fri, 25 Jan 2008 13:59:10 +0100 CONNECT BY for PostgreSQL http://www.postgresql-support.de/blog/blog_hans.html#blog2 CONNECT BY for PostgreSQL

We finally finished porting Evgen Potemkin's CONNECT BY patch to PostgreSQL 8.3.
CONNECT BY can be used to perform recursive queries. Unfortunately this is not part of the official SQL standard so it is basically an Oracle specific extension. However, many people are used to the (quite unflexible) Oracle style syntax so it might definitely be worthwhile to providing CONNECT BY for PostgreSQL. We did not bother modifying the patch to provide ANSI SQL syntax (= using WITH ...) as the current patch has far too many limitations by design.
Here are some experiences I made while we ported the patch from 8.2 to 8.3.

Downloading CONNECT BY

For those who want to use CONNECT BY for PostgreSQL 8.3 can checkout the tarball at http://www.postgresql.at/english/downloads_e.html

]]> Wed, 23 Jan 2008 11:48:02 +0100 connect-by-for-postgresql Hans-Juergen Schoenig Optimizing function calls in PostgreSQL 8.3 http://www.postgresql-support.de/blog/blog_hans.html#blog1 Being able to adjust the costs of function calls is definitely one of the most interesting features in PostgreSQL 8.3. It has a significant impact on many real world applications.

I did some practical tests to see how we can gain from adjusting costs of function calls.

]]> Wed, 16 Jan 2008 11:48:13 +0100 optimizing-function-calls-in-postgresql-83 Hans-Juergen Schoenig