Query Processing Concepts and Techniques for Set Containment Tests
Ralf Rantzau
Broschiertes Buch

Query Processing Concepts and Techniques for Set Containment Tests

Algorithms, algebra, and applications involving the relational division operator

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Relational division is an operator of the relational algebra that realizes universal quantifications in queries against a relational database, which can be interpreted as a set containment test. Expressing a universal quantification problem in SQL is cumbersome. Division was introduced by Edgar Codd in 1972 together with other operators of the relational algebra. However, unlike the join operator, for example, it has never been implemented in a commercial relational database system. If the division operator would have a counterpart in a query language, a more intuitive formulation of universal...