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Oracle Introduction to Oracle9i: SQL Sample Questions:

1. Which statement explicitly names a constraint?

A) ALTER TABLE student_grades ADD CONSTRAINT NAME = student_id_fk FOREIGN KEY (student_id) REFERENCES students(student_id);
B) ALTER TABLE student_grades ADD FOREIGN KEY (student_id) REFERENCES students(student_id);
C) ALTER TABLE student_grades ADD NAMED CONSTRAINT student_id_fk FOREIGN KEY (student_id) REFERENCES students(student_id);
D) ALTER TABLE student_grades ADD NAME student_id_fk FOREIGN KEY (student_id) REFERENCES students(student_id);
E) ALTER TABLE student_grades ADD CONSTRAINT student_id_fk FOREIGN KEY (student_id) REFERENCES students(student_id);

2. Examine the structure of the STUDENTS table:

You need to create a report of the 10 students who achieved the highest ranking in the course INT SQL and who completed the course in the year 1999.
Which SQL statement accomplishes this task?

A) SELECT student_id, marks, ROWNUM "Rank"
FROM (SELECT student_id, marks
FROM students
WHERE ROWNUM <= 10
AND finish_date BETWEEN '01-JAN-99' AND
'31-DEC-99'
AND course_id = 'INT_SQL'
ORDER BY marks DESC);
B) SELECT student_ id, marks, ROWNUM "Rank"
FROM students
WHERE ROWNUM <= 10
AND finish_date BETWEEN '01-JAN-99' AND '31-DEC-99'
AND course_id = 'INT_SQL'
ORDER BY marks DESC;
C) SELECT student_id, marks, ROWNUM "Rank"
FROM (SELECT student_id, marks
FROM students
ORDER BY marks DESC)
WHERE ROWNUM <= 10
AND finish_date BETWEEN '01-JAN-99' AND '31-DEC-99'
AND course_id = 'INT_SQL';
D) SELECT student_id, marks, ROWID "Rank"
FROM students
WHERE ROWID <= 10
AND finish_date BETWEEN '01-JAN-99' AND '31-DEC-99'
AND course_id = 'INT_SQL'
ORDER BY marks;

3. Examine the structure of the EMPLOYEES and NEW_EMPLOYEES tables:

Which UPDATE statement is valid?

A) UPDATE new_employees SET name = (SELECT last_name||
first_name
FROM employees
WHERE employee_id
=180)
WHERE employee_id =(SELECT employee_id
FROM new employees);
B) UPDATE new_employees SET name = (Select last_name||
first_name
FROM employees
Where employee_id
=180)
WHERE employee_id =180;
C) UPDATE new_employees SET name = (SELECT
last_name||first_name
FROM employees)
WHERE employee_id =180;
D) UPDATE new_employees SET name = (SELECT last name||
first_name
FROM employees
WHERE employee_id=
(SELECT employee_id
FROM new_employees))
WHERE employee_id
=180;

4. STUDENT_ID NUMBER(12)
SEMESTER_END DATE
GPA NUMBER(4,3)
Which statement finds the highest grade point average (GPA) per semester?

A) SELECT MAX(gpa) FROM student_grades WHERE gpa IS NOT NULL;
B) SELECT MAX(gpa) FROM student_grades WHERE gpa IS NOT NULL GROUP BY semester_end;
C) SELECT MAX(gpa) GROUP BY semester_end WHERE gpa IS NOT NULL FROM student_grades;
D) SELECT MAX(gpa) FROM student_grades GROUP BY semester_end WHERE gpa IS NOT NULL;
E) SELECT (gpa) FROM student_grades GROUP BY semester_end WHERE gpa IS NOT NULL;

5. You are granted the CREATE VIEW privilege. What does this allow you to do?

A) Create a view in any schema.
B) Create a view only of it is based on tables that you created.
C) Create a table view.
D) Create a sequence view in any schema.
E) Create a view in your schema.
F) Create a view that is accessible by everyone.

Solutions: