CSCE 421/821, Fall 2003, Glossary 4.

Assigned:  Monday, September 22, 2003.
Due: September 29, 2003.
Note: Glossaries are optional.

Specify the input and output of the operators below. (Indication: define the arity of the operator and what it computes.)

  1. Composition (of relations)
  2. Difference (of relations)
  3. Intersection (of relations)
  4. Join of relations (natural join).
  5. Projection (of relation)
  6. Selection (of relation)
  7. Union (of relation)
Do not forget to list your references.


choueiry@cse.unl.edu