Hi, with the MAR2010 release (x64 windows through installer) (and also the release Feb2010-SP2) I get an exception running a particular query, whilst a slightly modified one with the expected result (except for the naming of a result column) does not. I narrowed the problem down to this: sql>CREATE TABLE dbg (a INT, b INT); operation successful sql>INSERT INTO dbg (a,b) VALUES (10,10); 1 affected row (32.410ms) sql>SELECT a as d, SUM(b), (2 * (SUM(b) / (SELECT 2))) as f FROM dbg GROUP BY d; +------+------+------+ | d | L451 | f | +======+======+======+ | 10 | 10 | 10 | +------+------+------+ 1 tuple (8.841ms) sql>SELECT a as d, SUM(b) as e, (2 * (SUM(b) / (SELECT 2))) as f FROM dbg GROUP BY d; sql> The second select query does not produce a result set (as stated in the SQLException I get when doing this through JDBC). The monetdb client just shows a new prompt without stating any warning/error. The query works when I remove the "as e" ... or the "select 2" but in the real case I get this problem this select does much more than just selecting the number 2. I think this is a bug. Or am I doing something that is not (yet) supported in MonetDB? Thanks Bas Kaptijn