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Let r and s be two relations over the relation schemes R and S respectively, and let A be an attribute in R. then the relational algebra expression  is always equal to
  • a)
  • b)
    r
  • c)
  • d)
    None of the above
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
Let r and s be two relations over the relation schemes R and S respect...
The above expression evaluates A = a for tables r and s Option A : is only displaying attributes of table r on the select condition Option B : is only displaying attributes of table rOption C: evaluates A = a by joining tables r and s  efficiently , thus correct Therefore, Answer C  
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Let r and s be two relations over the relation schemes R and S respectively, and let A be an attribute in R. then the relational algebra expressionis always equal toa)b)rc)d)None of the aboveCorrect answer is option 'C'. Can you explain this answer?
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