Wed, 07 Jan 2009 14:55:16 +0100 Sylvain Thenault consider intersect *and* distinct
Wed, 07 Jan 2009 09:47:56 +0100 Sylvain Thenault in some cases (eg ambiguous neged relations), INTERSECT should be used instead of DISTINCT
Tue, 06 Jan 2009 12:53:47 -0800 Sandrine Ribeau merge
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