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Oracle Introduction to Oracle9i: SQL Sample Questions:

1. 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 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 (SELECT student_id, marks
FROM students
WHERE (finish_date BETWEEN '01-JAN-99 AND '31-DEC-99'
AND course_id = 'INT_SQL'
ORDER BY marks DESC)
WHERE ROWNUM <= 10;
C) SELECT student id, marks, ROWNUM "Rank"
FROM (SELECT student_id, marks
FROM students
ORDER BY marks)
WHERE ROWNUM <= 10
AND finish date BETWEEN '01-JAN-99' AND '31-DEC-99'
AND course_id = 'INT_SQL';
D) 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);
E) 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;

2. Examine the SQL statements that create ORDERS table:

For which columns would an index be automatically created when you execute the above
SQL statement? (Choose two)

A) ORDER_ID
B) SER_NO
C) ORD_TOTAL
D) STATUS
E) Composite index on ORDER_ID and ORDER_DATE
F) PROD_ID

3. Which syntax turns an existing constraint on?

A) ALTER TABLE table_name
TURN ON CONSTRAINT constraint_name;
B) ALTER TABLE table_name
ENABLE constraint_name;
C) ALTER TABLE table_name
ENABLE CONSTRAINT constraint_name;
D) ALTER TABLE table_name
TURN ON CONSTRAINT constraint_name;
E) ALTER TABLE table_name
STATUS = ENABLE CONSTRAINT constraint_name;
F) ALTER TABLE table_name
STATUS ENABLE CONSTRAINT constraint_name;

4. You need to change the definition of an existing table. The COMMERCIALS table needs its DESCRIPTION column changed to hold varying length characters up to 2000 bytes. The column can currently hold 1000 bytes per value. The table contains 20000 rows.
Which statement is valid?

A) ALTER TABLE commercials
CHANGE (description VARCHAR2(2000));
B) ALTER TABLE commercials
MODIFY (description VARCHAR2(2000));
C) ALTER TABLE commercials
CHANGE (description CHAR2(2000));
D) ALTER TABLE commercials
MODIFY (description CHAR2(2000));
E) You cannot increase the size of a column if the table has rows.

5. Which statement explicitly names a constraint?

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

Solutions: