[prog] SQL Joins
tiera
tiera at comhem.se
Fri Apr 16 08:40:45 EST 2004
On Wed, Apr 14, 2004 at 09:08:27AM -0700, Cynthia Kiser wrote:
> Not sure if mysql has subqueries now. If not, amend the "off contract"
> query in my previous post to:
> select **stuff you want**
> from **tables using your outer joins**
> where contract price is null
>
> And if mysql supports UNION ALL, that might give you better
> performance merging the two sets - since you know they are mutually
> exclusive.
>
Hi again.
The where-part of the above query would make me lose every product row
that isn't connected to a contract. Plus a product that is connected
to a contract doesn't have to have a contract price, so I would lose
those products too. As I said in my previous post I've rewritten it
with more than one query so I've got a solution for the moment.
Thanks again!
/Tiera
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