On Wed, 2008-05-28 at 11:45 +0100, Matthew Wakeling wrote: > On Tue, 27 May 2008, Simon Riggs wrote: > > I do recognise that we would *not* be able to deduce this form of SQL > > > > A JOIN B ON (a.id = c.id) LEFT JOIN C ON (b.id = c.id) > > Surely that would not be valid SQL? You are right, but my point was about inferences during SQL planning, not about initial analysis of the statement. -- Simon Riggs www.2ndQuadrant.com PostgreSQL Training, Services and Support
