Question: Design Of Database System Course True or False 1. Relations R and S have four and five tuples respectively. It is not possible that R

Design Of Database System Course

True or False

1. Relations R and S have four and five tuples respectively. It is not possible that R |x| S to have 0 tuple

2. A SQL SELECT statement may return an empty relation.

3. Apply a rename operation on a relation in relational algebra may reduce the number of rows in the relation.

4. When converting an ER diagram to relation schema, a relationship between two entities should always be implemented as a new relation.

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