Question: . QUESTION 16 Consider the SQL query select p.a1 from p, r1, r2 where p.a1 = r1.a1 or p.a1 = r2.a1 If there exists a

. QUESTION 16 Consider the SQL query select p.a1 from p, r1, r2 where p.a1 = r1.a1 or p.a1 = r2.a1 If there exists a tuple in r1 with a value for the r1.a1 attribute that also appears as a value in ...

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