Explain the concept of relations and predicates in relational model.
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The basic principle of the relational model is the Information Principle: all information is represented by data values in relations. In accordance with this Principle, a relational database is a set of relvars and the result of every query is presented as a relation.
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A boolean-valued function can also be called as a predicate in terms of mathematical logic.
There are several interpretations and necessities of predicates in logic and mathematics.
When coming to relations in relational models, they are tuples enclosed in a set used until the given predicated are all satisfied.
Both relations and predicates are needed in mathematical logic and boolean algebra for relational databases.
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