>you are using EAV schema - it is against to relation model enough :) >this schema has the most terrible performance for large datasets - looks on hstore instead >Pavel Actually despite the table named Attribute, I am not doing EAV though I can see why you'd think that. Attributes are part of the conceptual domain I'm modeling and I assure you there are first class columns in the schema for everything. Regardless, that has nothing to do with my performance problem with joining to a nested union. -Nate -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance