title: answering queries with aggregation using views. authors: d srivastava , s dar , h jagadish , a levy. venue: vldb. year: 1996
title: ã cents â ? ¬ answering queries with aggregation using viewsã cents â ? ¬ â ? cents. authors: d srivastava , s dar , hv jagadish , ay levy. venue: proc . of. year: nan