Under what conditions can the expression ? A ((R cond 1 S) cond 2 T) be transformed into ? A (? B (R cond 1 ? C (S)) cond2 ?D(T)) using the heuristic rules given in Section 11.2?
What will be an ideal response?
1. cond1 must involve only the attribute C from the S-side
2. cond2 must involve only the attribute B from the left side of the join and only the attribute D from the right.
Computer Science & Information Technology
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