Computer Science · Database Management Systems
Given below are two statements: one is labelled as Assertion (A) and the other as Reason (R). Assertion (A): SQL Set Operations combine the results of multiple SELECT statements horizontally by adding columns, whereas JOINs combine data vertically by adding rows based on a related column. Reason (R): Set Operations mandate that both SELECT statements must return the same number of columns with compatible data types, whereas a JOIN requires a related column between tables. In light of the above statements, choose the most appropriate answer:
- 1(A) is correct, but (R) is not correct
- 2Both (A) and (R) are correct, but (R) is NOT the correct explanation of (A)
- 3Both (A) and (R) are correct, and (R) is the correct explanation of (A)
- 4(A) is not correct, but (R) is correct✓
Correct answer
(A) is not correct, but (R) is correct
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