On Mar 27, 2009, at 6:40 PM, Bruce Momjian wrote:
Thanks, text updated:While semi-joins merely replace existing IN joins, anti-joins are a new capability for NOT EXISTS clauses (Tom) This improves optimization possibilities.
I'm not enough of a relational algebra geek to really understand what that means. Will there be a link or something to some documentation or even, *gasp*, a blog entry explaining what this means and why it's important?
Thanks, David -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
