Relational Algebra. Dashiell Fryer. What is Relational Algebra?. Relational algebra is a procedural query language. It consists of the select, project, union, set difference, Cartesian product, and rename operations.
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borrower.loan-number, loan.loan-number, loan.branch-name, loan.amount)
E1 – E2
E1 × E2
σP(E1), P is the predicate
ΠS(E1), S is a list of attributes in E1
ρx(E1), x is the new name of E1
a. tr[S] = ts[R]
b. tr[R – S] = t