Hey all,
I've checked the archives and found an explanation as to how the check
if a record is not in a many-to-many table. The answer to that is
somewhat simple and clear to me. But here's my problem: how do you
check if a record doesn't have a *particular* many-to-many
relationship? As in, let's say I have three tables: users, groups, and
users_groups linking the two in a many-to-many relationship. Now let's
say that I want to select all users who are not in the group "Group1" --
that is, that user may have entries in the users_groups table, but they
would be for other groups, not "Group1."
One more thing: this is easily done with subqueries, but for performance
reasons, I need to do it with explicit joins. Anyone know how I can do
this?
Thanks,
marco
--
Marco Carbone
Webmaster/Web Developer
Committee to Regulate and Control Marijuana
http://www.regulatemarijuana.org
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