Which two statements would execute successfully?

Examine the structure of the MARKS table:
name Null Type
STUDENT_ID NOT NULL VARCHAR2(4)
STUDENT_NAME VARCHAR2(25)
SUBJECT1 NUMBER(3)
SUBJECT2 NUMBER(3)
SUBJECT3 NUMBER(3)
Which two statements would execute successfully? (Choose two.)

A.
SELECT student_name,subject1
FROM marks
WHERE subject1 > AVG(subject1);

B.
SELECT student_name,SUM(subject1)
FROM marks
WHERE student_name LIKE ‘R%';

C.
SELECT SUM(subject1+subject2+subject3)
FROM marks
WHERE student_name IS NULL;

D.
SELECT SUM(DISTINCT NVL(subject1,0)), MAX(subject1)
FROM marks
WHERE subject1 > subject2;

Discussion

6 Responses to “Which two statements would execute successfully?”

  1. chachu says:

    hi ,

    why is B incorrect?

  2. Bina says:

    Why A is wrong?

  3. Nikita Gupta says:

    can anyone plz explain clearly why option b is incorrect

  4. Ritam Tiwari says:

    B is incorrect because if we are using aggregate function then we have to group by all the remaining columns that are in select statements.

    so ‘group by student_name’ should be there.

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