|< < 5 > >|

Relation Algebra: operations on sets of tuples

A relation has metadata and data.

Relation metadata

  • Name
  • Ordered set of (column name, column type).

Content of a relation

  • A set of 0 or more or consistent with the column metadata.

Relational Algebra operations yield relations

To define each operation, we have to give rules for deriving both data and metadata of the result.

|< < 5 > >|