I have found this: SELECT c.* FROM contacts c WHERE c.id IN ( SELECT p.contact_id FROM phone p WHERE p.addr = ? ) OR c.id IN (SELECT e.contact_id FROM email e WHERE e.addr = ? );
To have a worse plan than: SELECT * FROM contacts where id IN ( ( SELECT c.id FROM contacts c JOIN phone p ON c.id = p.contact_id AND p.addr = ? UNION SELECT c.id FROM contacts c JOIN email e ON c.id = e.contact_id AND e.addr = ? ); Maybe this is no surprise. But after discovering this my question is this, is there another option I dont' know about that is logically the same that can perform even better than the UNION?
