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Oracle Introduction to Oracle9i: SQL Sample Questions:

1. The STUDENT_GRADES table has these columns:

The registrar has asked for a report on the average grade point average (GPA) for students enrolled during semesters that end in the year 2000. Which statement accomplish this?

A) SELECT AVG (gpa)
FROM student_grades
WHERE semester_end BETWEEN '01-JAN-2000' and '31.DEC.2000';
B) SELECT MEDIAN (gpa)
FROM student_grades
WHERE semester end > '01-JAN-2000' and semester end < '31-DEC-2000';
C) SELECT MIN (gpa)
FROM student grades
WHERE semester_end > '01-JAN-2000' and semester end < '31-DEC-2000';
D) SELECT AVERAGE (gpa)
FROM student_grades
WHERE semester_end > '01-JAN-2000' and semester end < 31-DEC-2000';
E) SELECT COUNT (gpa)
FROM student grades
WHERE semester_end > '01-JAN-2000' and semester end < '31-DEC-2000';
F) SELECT SUM (gpa)
FROM student grades
WHERE semester_end > '01-JAN-2000' and semester end < '31-DEC-2000';

2. Which three are true regarding the use of outer joins? (Choose three.)

A) You cannot use IN operator in a condition that involves an outerjoin.
B) You use an outerjoin to see only the rows that do not meet the join condition.
C) You cannot link a condition that is involved in an outerjoin to another condition by using the OR operator.
D) You use (*) on both sides of the WHERE condition to perform an outerjoin.
E) In the WHERE condition, you use (+) following the name of the column in the table without matching rows, to perform an outerjoin.
F) You use (+) on both sides of the WHERE condition to perform an outerjoin.

3. Examine the structure of the EMPLOYEES table:

You need to update the records of employees 103 and 115. The UPDATE statement you specify should update the rows with the values specified below:

Which UPDATE statement meets the requirements?

A) UPDATE employees
SET job_id = DEFAULT,
Sal = (SELECT MAX(sal)
FROM employees
WHERE job_id = 'SA_REP')
comm_pct = DEFAULT OR NULL,
department_id = &did
WHERE employee_id IN (103,115);
B) UPDATE employees SET job_id = DEFAULT AND Sal = (SELECT MAX(sal) FROM employees WHERE job_id = 'SA_REP') AND comm_pct = DEFAULT AND department_id = &did WHERE employee_id IN (103,115);
C) UPDATE employees SET job_id = DEFAULT, Sal = (SELECT MAX(sal)
FROM employees
WHERE job_id = 'SA_REP'),
comm_pct = DEFAULT,
department_id = &did
WHERE employee_id IN (103,115);
D) UPDATE employees
SET job_id = DEFAULT,
Sal = MAX(sal),
comm_pct = DEFAULT,
department_id = &did
WHERE employee_id IN (103,115)
AND job_id = 'SA_REP';
E) UPDATE employees SET job_id = DEFAULT AND Sal = MAX(sal) AND comm_pct = DEFAULT OR NULL AND department_id = &did WHERE employee_id IN (103,115) AND job_id = 'SA_REP';

4. Which four are types of functions available in SQL? (Choose 4)

A) translation
B) date
C) calendar
D) conversion
E) numeric
F) string
G) integer
H) character

5. What are two reasons to create synonyms? (Choose two.)

A) You want to use another schema's tables.
B) You have too many columns in your tables.
C) Your tables names are too long.
D) Your tables have difficult names.
E) You want to work on your own tables.
F) You have too many tables.

Solutions: