I have been using subqueries in Where clauses since I learned TSQL. This SQL below gives me all of the data in one table that is not in another table. Clemons, try doing that with XML! <g>

select location_id  from rpt_rcep11 where location_ID not in (select location_ID from dbo.tblExtrnl_Location_Mapping group by location_ID) group by location_id