Moshe Jacobson wrote > I have the following query: > [...] > The EXPLAIN ANALYZE for this query indicates that all of the tables in the > query are being joined despite the fact that they are not needed at all. > > Why is this? Without definitions of all the tables involved, as well as knowing what version you are running this query on, it is impossible to explain why. https://wiki.postgresql.org/wiki/What's_new_in_PostgreSQL_9.0 Read the section named "Join Removal". It would seem that in theory at least some of these could be removed - though maybe not all of them - if you are running 9.0+ (possibly after some schema changes). David J. -- View this message in context: http://postgresql.1045698.n5.nabble.com/Optimizer-issue-bad-query-plan-tp5806260p5806264.html Sent from the PostgreSQL - general mailing list archive at Nabble.com.
