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Oracle Introduction to Oracle9i: SQL Sample Questions:

1. The STUDENT_GRADES table has these columns:
STUDENT_ID NUMBER (12)
SEMESTER_END DATE
GPA NUMBER (4,3)
The register has requested a report listing the students' grade point averages (GPA), sorted from highest grade point average to lowest within each semester, starting from the earliest date. Which statement accomplishes this?

A) SELECT student_id, semester_end, gpa FROM student_grades ORDER BY gpa DESC, semester_end DESC;
B) SELECT student_id, semester_end, gpa FROM student_grades ORDER BY semester_end ASC, gpa ASC;
C) SELECT student_id, semester_end, gpa FROM student_grades ORDER BY semester_end, gpa DESC;
D) SELECT student_id, semester_end, gpa FROM student_grades ORDER BY gpa DESC, semester_end ASC;
E) SELECT student_id, semester_end, gpa FROM student_grades ORDER BY semester_end DESC, gpa DESC;

2. In a SELECT statement that includes a WHERE clause, where is the GROUP BY clause placed in the SELECT statement?

A) After the WHERE clause
B) After the ORDER BY clause
C) Before the FROM clause
D) Before the WHERE clause
E) Immediately after the SELECT clause

3. Examine the data from the EMP table:

The COMMISSION column shows the monthly commission earned by the employee.
Which three tasks would require subqueries or joins in order to perform in a single step? (Choose three)

A) Deleting the records of employees who do not earn commission.
B) Finding the number of employees who do NOT earn commission and are working for department 20.
C) Increasing the commission of employee 3 by the average commission earned in department 20.
D) Inserting into the table a new employee 10 who works for department 20 and earns a commission that is equal to the commission earned by employee 3.
E) Decreasing the commission by 150 for the employees who are working in department 30 and earning a commission of more then 800.
F) Creating a table called COMMISSION that has the same structure and data as the columns EMP_ID and COMMISSIONS of the EMP table.

4. Examine the description of the MARKS table:

SUBJ1 and SUBJ2 indicate the marks obtained by a student in two subjects.
Examine this SELECT statement based on the MARKS table:
SELECT subj1+subj2 total_marks, std_id
FROM marks
WHERE subj1 > AVG (subj1) AND subj2 > AVG(subj2)
ORDER BY total_marks;
What is the result of the SELECT statement?

A) The statement returns an error at the ORDER BY clause.
B) The statement returns an error at the WHERE clause.
C) The statement returns an error at the SELECT clause.
D) The statement executes successfully and returns the student ID and sum of all marks for each student who obtained more than the average mark in each subject.

5. Which operator can be used with a multiple-row subquery?

A) IS
B) BETWEEN
C) <>
D) LIKE
E) =
F) NOT IN

Solutions: