Які з зазначених характеристик відносяться до Relational Calculus у формальних мовах запит ів

Question

Які з зазначених характеристик відносяться до Relational Calculus у формальних мовах  запит ів

Accepted Answer

Queries are sub set s of first-order logic

Answer

A type of non-procedural (or declarative) formal query language

Answer

Queries describe desired answers without specify in g how they  will be computed

Answer

Queries are composed of operators

Answer

Each query describes a step-by-step procedure for comput in g  the desired answer

Answer

Very useful for represent in g  exec ution plans

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