00357nam a2200145Ia 4500008004100000020001500041082002400056100001800080245002100098250000600119260003800125300000500163650001000168650003300178140316s9999    xx            000 0 und d  a8170296447  a005.133 SQLbGRU/UN  aGraber,Martin  aUnderstandin SQL  a1  aNew DelhibBPB Publicationsc1995  a  aRDBMS  aRelational boolean operators