In relational algebra, a rename is a unary operation written as formula_1 where:
The result is identical to R except that the b attribute in all tuples is renamed to a. For an example, consider the following invocation of ρ on an Employee relation and the result of that invocation:
Formally, the semantics of the rename operator is defined as follows:
 formula_2
where formula_3 is defined as the tuple t, with the b attribute renamed to a, so that:
 formula_4
References.
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