framework/resources/Functional/joins/nulleqjoin/neqjnPrtnBy_04.q

SELECT t1.col_vrchr2 c1, t2.col_vrchr2 c2 
FROM l_tblprtnby_vrchrcl2 t1, r_tblprtnby_vrchrcl2 t2 
WHERE t1.col_vrchr2 = t2.col_vrchr2 OR (t1.col_vrchr2 IS NULL AND t2.col_vrchr2 IS NULL);