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Test 2 - Databases | Computer Science(CS)

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Multiple Choice

Given relations r(w,x) and s(y,z), the result of select distinct w,x from r,s is guaranteed to be the same as r, provided

  1. r has no duplicate and s is non empty
  2. r and s have no duplicate
  3. s has no duplicate and r is non empty
  4. r and s have the same number of tuples
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