GATE Papers >> CSE >> 2014 >> Question No 231

Question No. 231 CSE | GATE 2014

What is the optimized version of the relation algebra expression πA1πA2σF1σF2r, where A1, A2 are sets of attributes in r with A1 ⊂ A2 and F1, F2 are Boolean expressions based on the attributes in r?

Answer : (A) πA1σF1ΛF2r

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