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