Review. Exam Su 3:30PM - 6:30PM 2010/12/12 Room C9000. Algebra. Relational Algebra Operations. Basic operations Selection ( ) Selects a subset of rows from relation. Projection ( ) Deletes unwanted columns from relation.
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Suppose that relation R contains attributes A1 ... An. A decompositionof R consists of replacing R by two or more relations such that:
Does A B hold?
Does BC A hold?
Does not hold (first two tuples)
Does B C hold?
Does not hold (last 2 tuples)