title: join synopses for approximate query answering swarup acharya , viswanath poosala , phillip b. gibbons , sridhar ramaswamy sigmod conference. authors: nan. venue: nan. year: 1999.0
title: new sampling-based summary statistics for improving approximate query answers phillip b. gibbons , yossi matias 1998. authors: nan. venue: international conference on management of data. year: nan