Let R = (A, B, C), and let r1 and r2 both be relations on schema R.
Question:
Let R = (A, B, C), and let r1 and r2 both be relations on schema R. Give expressions in QBE, and Datalog equivalent to each of the following queries:
a. r1 ∪ r2
b. r1 ∩ r2
c. r1 − r2
d. IIAB (r1) 1 IIBC (r2)
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a 1 U r2 i ii b r r i c 71 i result A B 12 P P HABO r2 333 ...View the full answer
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