title: implementation of two semantic query optimization techniques in db2 universal database q cheng , j gryz , f koo , t leung , l liu , x qian , k schiefer vldb. authors: nan. venue: nan. year: 1999.0
title: implementation of two semantic query optimization techniques in db2 universal database q cheng , j gryz , f koo , tyc leung , l liu , x qian ,. authors: nan. venue: vldb ,. year: 1999.0