Re: JOIN and max query

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#11096

From: DP
Date: Thu, 12 Dec 2002 16:59

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> This is a corellated subquery.  It runs once for each line in the
> result set.  Hence, if the result set is large your query will be slow.
> You can optimize this with a SELECTable stored proc if this becomes a
> problem.

Excellent, it works as well ;-)

I don't really understand why

  (B1.A_ID IS NULL) OR

is included, it seems to ensure that the outer join works, without it, the
outer join works as an inner join.

Thanks

David

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Subject: Re: JOIN and max query
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