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Re: How to get a Hash Anti-Join to take?

From: Telemachus <telemachus_at_ulysseswillreturn.net>
Date: Tue, 6 May 2003 11:12:10 +0100
Message-ID: <_TLta.12006$pK2.15734@news.indigo.ie> 





Snippety Snip



It only works when there's NOT NULL constraints... not a condition...



i.e. where <X> is not null in the   query will not get the HJ to work.  it
must be a constraint.



It's one of the <few> constraint-based optimizations. It used to be
documented in 7.3 manuals but it's now left out for some reason.



Otherwise you tend to get a nasty FILTER operation
Received on Tue May 06 2003 - 05:12:10 CDT












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