Issue No. 04 - December (1989 vol. 1)
DOI Bookmark: http://doi.ieeecomputersociety.org/10.1109/69.43418
<p>Efficient least-fixpoint query evaluation is crucial to using logic as the query language for relational databases. The authors present a selection transposition algorithm that allows selections that are conjunctions of the predicates of the form column theta value to be evaluated ahead of the least-fixpoint operator while processing linear recursive queries. It is also shown that the algorithm transposes the strongest possible selection.</p>
moving selections; linear least fixpoint queries; query language; relational databases; selection transposition algorithm; predicates; least-fixpoint operator; linear recursive queries; information retrieval; query languages; relational databases
P. Devanbu and R. Agrawal, "Moving Selections into Linear Least Fixpoint Queries," in IEEE Transactions on Knowledge & Data Engineering, vol. 1, no. , pp. 424-432, 1989.