Rename (relational algebra)

In relational algebra, a rename is a unary operation written as $\rho_(R)$ where:

* is a relation
* and are attribute names
* is an attribute of

The result is identical to except that the attribute in all tuples is renamed to . For an example, consider the following invocation of on an relation and the result of that invocation:

Formally, the semantics of the rename operator is defined as follows:

: $\rho_(R) = \,$

where t /b/math> is defined as the tuple , with the attribute renamed to , so that:

: t /b= \ \cup \.

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Relational algebra