Ich hab's gerade in der IBM-Doku gefunden (ein simulierter Full Outer Join):

SELECT EMPNO, LASTNAME, PROJNO
FROM CORPDATA.EMPLOYEE LEFT OUTER JOIN CORPDATA.PROJECT
ON EMPNO = RESPEMP
WHERE LASTNAME > 'S'
UNION
(SELECT EMPNO, LASTNAME, PROJNO
FROM CORPDATA.PROJECT EXCEPTION JOIN CORPDATA.EMPLOYEE
ON EMPNO = RESPEMP
WHERE LASTNAME > 'S')
Vielen Dank,
KM