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<p>Datalog, a database query language based on the logic programming paradigm, is described. The syntax and semantics of Datalog and its use for querying a relational database are presented. Optimization methods for achieving efficient evaluations of Datalog queries are classified, and the most relevant methods are presented. Various improvements of Datalog currently under study are discussed, and what is still needed in order to extend Datalog's applicability to the solution of real-life problems is indicated.</p>
optimisation methods; Datalog; database query language; logic programming; syntax; semantics; relational database; logic programming; query languages; relational databases

G. Gottlob, S. Ceri and L. Tanca, "What You Always Wanted to Know About Datalog (And Never Dared to Ask)," in IEEE Transactions on Knowledge & Data Engineering, vol. 1, no. , pp. 146-166, 1989.
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