On Tue, May 6, 2008 at 11:27 AM, Frank van Vugt <ftm.van.vugt@xxxxxxx> wrote: >> > db=# explain analyse >> > select sum(base_total_val) >> > from sales_invoice >> > where id in (select id from si_credit_tree(80500007)); >> >> Did you check whether this query even gives the right answer? > > You knew the right answer to that already ;) > >> I think you forgot the alias foo(id) in the subselect and it's >> actually reducing to "where id in (id)", ie, TRUE. > > Tricky, but completely obvious once pointed out, that's _exactly_ what was > happening. This is one of the reasons why, for a table named 'foo', I name the columns 'foo_id', not 'id'. Also, if you prefix the id column with the table name, you can usually use JOIN USING which is a little bit tighter and easier than JOIN ON. merlin
