title: estimating the output cardinality of partial preaggregation with a measure of clusteredness s helmer , t neumann , g moerkotte 2003. authors: nan. venue: vldb. year: nan
title: estimating the output cardinality of partial preaggregation with a measure of clusteredness s helmer , t neumann , g moerkotte. authors: nan. venue: proceedings of the international conference on very large & hellip ; ,. year: 2003.0