Discussion
Which of the following statements is not true for Relational Algebra ?
Answer: B
The statement that is not true is Natural join is a fundamental operation in relational algebra.
The fundamental operations of relational algebra are select, project, union, set difference, Cartesian product and rename. Natural join is a derived operation: it can be written as a Cartesian product followed by a selection on the common attributes and a projection to remove duplicate columns.
The other statements are true. Relational algebra is procedural, since a query states the sequence of operations to apply. Selection is written with σ, and its predicate appears as a subscript, as in \(\sigma_{marks \gt 60}(student)\).
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