On Tue, Jan 14, 2014 at 12:07 PM, knizhnik <knizh...@garret.ru> wrote: > But is it possible to use index for derived table at all?
Yes, the planner will do an index scan when it makes sense. > Why sequential search is used for derived table in the example below: > insert into derived_table values (2,2); > create index derived_index on derived_table(x); > explain select * from base_table where x>=0; With only 1 row in the table, the planner decides there's no point in scanning the index. Try with more realistic data. Regards, Marti -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
