On Fri, 3 Apr 2009, Robert Haas wrote:
> On Fri, Apr 3, 2009 at 9:32 AM, Matthew Wakeling <matthew@flymine.org> wrote:
>> I'm writing a plpgsql function that effectively does a merge join on the
>> results of two queries.
> Why not just use SQL to do the join?
Because the merge condition is:
WHERE l1.start <= l2.end AND l2.start <= l1.end
and merge joins in postgres only currently cope with the case where the
merge condition is an equals relationship.
Oh, hang on, I think I saw something in the docs about what conditions can
be used in a merge...
Matthew
--
Let's say I go into a field and I hear "baa baa baa". Now, how do I work
out whether that was "baa" followed by "baa baa", or if it was "baa baa"
followed by "baa"?
- Computer Science Lecturer
