Given table R (A, B, C) and S (C, D, E), which of the following SQL statements would find the record (s) with null values on the column C in table R?

a. select * from R, S where R. C = S. C (+); (R left outer join S)

b. select * from R, S where S. C = R. C (+); (R right outer join S)

c. either a. or b.

d. neither a. nor b.

Question

Computers & Technology

Ali Lutz

15 June, 18:27

Given table R (A, B, C) and S (C, D, E), which of the following SQL statements would find the record (s) with null values on the column C in table R?

a. select * from R, S where R. C = S. C (+); (R left outer join S)

b. select * from R, S where S. C = R. C (+); (R right outer join S)

c. either a. or b.

d. neither a. nor b.

+1

Answers (1)

Know the Answer?

Brenda Pollard · Answer 1

a. select * from R, S where R. C = S. C (+); (R left outer join S)

Explanation:

In SQL, left outer join of two tables R and S joined on a common column C means that all rows of R are included in the result including those rows for which value of R. C is null. On the contrary, right outer join of two tables R and S joined on a common column C means that all rows of S are included in the result including those rows for which value of S. C is null. As per the question our requirement is the former. So option a is correct.