What is Relational Calculus?
Solution
Relational calculus is a non-procedural query language that tells the system what data to be retrieved but doesn’t tell how to retrieve it. It is used in databases and it forms the theoretical basis of query languages such as SQL.
Relational calculus consists of two types of calculi, the tuple relational calculus and the domain relational calculus.
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Tuple Relational Calculus (TRC): In TRC, filtering variable uses the tuples of a relation. The main goal of TRC is to find those tuples that satisfy the given condition.
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Domain Relational Calculus (DRC): In DRC, the filtering variable uses the domain of attributes instead of entire tuple values. It is used to retrieve selected tuples from the relation.
In both types of relational calculus, queries are expressed as formulas, and the result of a query is a relation that satisfies the formula.
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