>Hi All,
>This works in SQL Server, however VFP cannot handle the complexity. :( I'm not sure how to rewrite it.

>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?

I don't think your subquery knows anything about your "S" alias since it's in the main query.