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Oracle Introduction to Oracle9i: SQL Sample Questions:

1. Which view should a user query to display the columns associated with the constraints on a table owned by the user?

A) USER_CONSTRAINTS
B) USER_COLUMNS
C) ALL_CONSTRAINTS
D) USER_CONS_COLUMNS
E) USER_OBJECTS

2. 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 semester_end DESC, gpa 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 gpa DESC, semester_end ASC;
D) SELECT student_id, semester_end, gpa FROM student_grades ORDER BY semester_end, gpa DESC;
E) SELECT student_id, semester_end, gpa FROM student_grades ORDER BY gpa DESC, semester_end DESC;

3. Examine this statement:
SELECT student_id, gpa FROM student_grades WHERE gpa > &&value;
You run the statement once, and when prompted you enter a value of 2.0. A report is produced. What happens when you run the statement a second time?

A) You are prompted to enter a new value.
B) You are asked whether you want a new value or if you want to run the report based on the previous value.
C) A report is produced that matches the first report produced.
D) An error is returned.

4. 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
ORDER BY marks DESC)
WHERE ROWNUM <= 10
AND finish_date BETWEEN '01-JAN-99' AND '31-DEC-99'
AND course_id = 'INT_SQL';
C) 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);
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;

5. You need to modify the STUDENTS table to add a primary key on the STUDENT_ID column. The table is currently empty.
Which statement accomplishes this task?

A) ALTER TABLE students
ADD PRIMARY KEY student_id;
B) ALTER TABLE students
MODIFY CONSTRAINT stud_id_pk PRIMARY KEY (student_id);
C) ALTER TABLE students
ADD CONSTRAINT stud_id_pk PRIMARY KEY (student_id);
D) ALTER TABLE students
ADD CONSTRAINT PRIMARY KEY (student_id);
E) ALTER TABLE students
ADD CONSTRAINT stud_id_pk PRIMARY KEY student_id;

Solutions: