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For each of the following Datalog rules, write an expression of relational algebra that defines the same relation as the head of the rule: i
For each of the following Datalog rules, write an expression of relational algebra that defines the same
relation as the head of the rule:
i Px y Qx z AND Rz y
ii Px y Qx z AND Qz y
iii. Px y Qx z AND Rz y AND x y
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