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Given relations r(w, x) and s(y, z), the result of
is guaranteed to be same as r, provided
  • a)
    r has no duplicates and s is non-empty
  • b)
    r and s have no duplicates
  • c)
    s has no duplicates and r is non-empty
  • d)
    r and s have the same number of tuples
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
Given relations r(w, x) and s(y, z), the result ofis guaranteed to be ...
R has no duplicates and s is non-empty The query selects all attributes of r. Since we have distinct in query, result can be equal to r only if r doesn’t have duplicates. If we do not give any attribute on which we want to join two tables, then the queries like above become equivalent to Cartesian product. Cartisian product of two sets will be empty if any of the two sets is empty. So, s should have atleast one record to get all rows of r. 
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Given relations r(w, x) and s(y, z), the result ofis guaranteed to be same as r, provideda)r has no duplicates and s is non-emptyb)r and s have no duplicatesc)s has no duplicates and r is non-emptyd)r and s have the same number of tuplesCorrect answer is option 'A'. Can you explain this answer? for Computer Science Engineering (CSE) 2025 is part of Computer Science Engineering (CSE) preparation. The Question and answers have been prepared according to the Computer Science Engineering (CSE) exam syllabus. Information about Given relations r(w, x) and s(y, z), the result ofis guaranteed to be same as r, provideda)r has no duplicates and s is non-emptyb)r and s have no duplicatesc)s has no duplicates and r is non-emptyd)r and s have the same number of tuplesCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for Computer Science Engineering (CSE) 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Given relations r(w, x) and s(y, z), the result ofis guaranteed to be same as r, provideda)r has no duplicates and s is non-emptyb)r and s have no duplicatesc)s has no duplicates and r is non-emptyd)r and s have the same number of tuplesCorrect answer is option 'A'. Can you explain this answer?.
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