>Ok, is seems like I knew how to do this, but for some reason, I'm just not making the right connections this morning. :) I have this union:
>
>

>SELECT purno, potype, purdate, currid, postat, puramt, recamt, vendno, company, "C" AS chfile ;
>  FROM a_pomast ;
>  INTO CURSOR ac_pomast ;
>UNION ;
>SELECT purno, potype, purdate, currid, postat, puramt, recamt, vendno, company, "H" AS chfile ;
>  FROM a_poymst
>

>
>There are some records that are in both tables. Normally, they would be filtered out as duplicates. But because I added that extra field to tell me which table they came from, they're showing up as unique. How do I tell it to filter duplicates based just on the purno?
>
>Thanks,
>
>Michelle

You may want to try using where clause like
WHERE a_pomast.purno is not in (SELECT purno, potype, purdate, currid, postat, puramt, recamt, vendno, company, "H" AS chfile) - normally SBT has a field that with current mark(X) to let you know that the record is have been moved to history.

Carl