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Question: Relation C is a projection of relation A. Which of the following statements must be true in all cases where relation C is different from relation A?
1. The cardinality of C is greater than the cardinality of A
2. The cardinality of C is less than the cardinality of A
3. he arity of C is greater than arity of A
4. The arity of C is less than the arity of A
Check Answer
1. The cardinality of C is greater than the cardinality of A
2. The cardinality of C is less than the cardinality of A
3. he arity of C is greater than arity of A
4. The arity of C is less than the arity of A
Check Answer
