In the question <http://stackoverflow.com/questions/35891605/why-do-i-receive-an-unexpected-result> David Paton asks about a query like this:
create table a(id integer primary key); create table b(id integer primary key); insert into a values (1), (2); insert into b values (1); select id from a where id not in (select a.id from b); which outputs one result (2), although the expected result would be empty. The EXPLAIN outputs shows that the database behaves as if the subquery were referring to b.id, and in fact making that change in the query results in exactly the same EXPLAIN output. Regards, Clemens
