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Relational Algebra

Once the relationships are identified, then operations that are applied on the relations are also identified. In relational model, the operations are performed with the help of relational algebra. Relational algebra is a collection of operations on relations.

Each operation takes one or more relations as its operand(s) and produces another relation as its result. We can compare relational algebra with traditional arithmetic algebra.

In arithmetic algebra , there are operators that operate on operands( data values) and produce some result. Similarly in relational algebra there are relational operators that operate upon relations and produce relations as results.

Relational algebra can be divided into two groups:

1. Traditional set operators that includes union, intersection, difference, and Cartesian product.

2. Special relational operators that includes selection, projection, and division

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