Whats wrong with this statement??
SELECT P.productNum, P.description, PL.locationNum, PL.quantityOnHand
FROM PRODUCT AS P, PROD_LOCATION AS PL
WHERE PL.quantityOnHand > 0
ORDER BY P.productNum, PL.warehouseNum, PL.locationNum
GROUP BY P.productNum, P.description, PL.locationNum...