Suppose now that R(A,B) and S(A,B) are two relations with r and s tuples, respectively (again, not necessarily distinct). If m is the number of (not necessarily distinct) tuples in the result of the SQL query:R intersect S;Then which of the following is the most restrictive, correct condition on the value of m?0 <= m <= min(r,s)min(r,s) <= m <= max(r,s)0 <= m <= r + sm = min(r,s)
Question
Suppose now that R(A,B) and S(A,B) are two relations with r and s tuples, respectively (again, not necessarily distinct). If m is the number of (not necessarily distinct) tuples in the result of the SQL query:R intersect S;Then which of the following is the most restrictive, correct condition on the value of m?0 <= m <= min(r,s)min(r,s) <= m <= max(r,s)0 <= m <= r + sm = min(r,s)
Solution
The most restrictive, correct condition on the value of m is 0 <= m <= min(r,s).
This is because the INTERSECT operation in SQL returns the common records between two tables. Therefore, the maximum number of records that can be returned is the minimum number of records in either of the two tables, and the minimum is 0, in case there are no common records.
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