Topic: Database Management Systems
In SQL the statement select * from R, S is equivalent to
- A. Select * from R natural join S
- B. Select * from R cross join S
- C. Select * from R outer join S
- D. Select * from R inner join S
Answer: B. Select * from R cross join S
Explanation: In SQL, selecting from multiple tables separated by a comma (e.g., `FROM R, S`) without specifying a `WHERE` clause for join conditions evaluates to a Cartesian product, which is functionally equivalent to a cross join.