Hello! I have an issue with MonetDB query. This one select count(*) from catalogedsources c1 left outer join catalogedsources c2 on ( c2.cat_id = c1.cat_id + 2 AND ((c1.decl - c2.decl) * (c1.decl - c2.decl))< 1e-06) where c1.cat_id = 4 AND c1.decl BETWEEN 77.0 AND 83.0 AND c1.ra BETWEEN 42.0 AND 48.0 ; works fine. But if I replace "c2.cat_id = c1.cat_id + 2" with "c2.cat_id = 6" - i receive nothing. Not zero, not empty dataset, but just nothing at all. "EXPLAIN" does not work as well. Also, with more complex join conditions I have no result as well. I am using: Welcome to mclient, the MonetDB/SQL interactive terminal (Dec2011-SP1) Database: MonetDB v11.7.7 (Dec2011-SP1), 'mapi:monetdb://linux-6d2s.site:50000/*****' What can this be? Regards, Alexey