title: the aqua approximate query answering system. authors: sridhar ramaswamy , swarup acharya , phillip b. gibbons , viswanath poosala. venue: sigmod conference. year: 1999.0
title: a robust , optimization-based approach for approximate answering of aggregate queries 2001. authors: surajit chaudhuri , gautam das , vivek narasayya. venue: international conference on management of data. year: nan