However, select unique a.* from dba_users a where username in (select username from dba_tables b); Does produce a result, not an error. BANNER ---------------------------------------------------------------- Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bi PL/SQL Release 10.2.0.4.0 - Production CORE 10.2.0.4.0 Production TNS for 64-bit Windows: Version 10.2.0.4.0 - Production NLSRTL Version 10.2.0.4.0 - Production On Tue, Mar 29, 2011 at 2:36 PM, Mark Strickland <strickland.mark@xxxxxxxxx>wrote: > Hmm okay, I'll accept it, but I don't have to like it. Thanks for > responding! > > Mark >