SELECT S.Clm_Id, S.Svc_Dt ; FROM Mc_MdSvc S, Mc_MdClm C ; WHERE C.Adjt_Stat = "Z" ; AND C.Clm_Id = S.Clm_Id ; AND NOT EXISTS (SELECT * FROM Mc_PlnHs P ; WHERE P.Mem_Num = C.Mem_Num ; AND P.Active_Ind = .T. ; AND P.Pln_Id = C.Pln_Id ; AND P.Ins_Id_Num = C.Ins_Id_Num ; AND P.Eff_From <= S.Svc_Dt ; AND P.Eff_Thru >= S.Svc_Dt)What it chokes on is the last 2 lines of the subquery. It only can handle equality. Any Ideas?