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Oracle Introduction to Oracle9i: SQL Sample Questions:

1. The EMPLOYEE tables have these columns:

You want to display the name and annual salary multiplied by the commission_pct for all employees. For records that have a NULL commission_pct, a zero must be displayed against the calculated column.
Which SQL statement displays the desired results?

A) SELECT last_name, (salary * 12) * NVL2(commission_pct, 0) FROM EMPLOYEES;
B) SELECT last_name, (salary * 12) * IFNULL(commission_pct, 0) FROM EMPLOYEES;
C) SELECT last_name, (salary * 12) * commission_pct FROM EMPLOYEES;
D) SELECT last_name, (salary * 12) * NVL(commission_pct, 0) FROM EMPLOYEES;

2. Evaluate the SQL statement:
TRUNCATE TABLE DEPT;
Which three are true about the SQL statement? (Choose three.)

A) An attempt to use DESCRIBE on the DEPT table after the TRUNCATE statement executes will display an error.
B) You can roll back the deletion of rows after the statement executes.
C) It does not release the storage space used by the table.
D) It releases the storage space used by the table.
E) You must be the owner of the table or have DELETE ANY TABLE system privileges to truncate the DEPT table
F) You can NOT roll back the deletion of rows after the statement executes.

3. Examine the data of the EMPLOYEES table.
EMPLOYEES (EMPLOYEE_ID is the primary key. MGR_ID is the ID of managers and refers to the EMPLOYEE_ID)

Evaluate this SQL statement:
SELECT e.employee_id "Emp_id", e.emp_name "Employee", e.salary,
m.employee_id "Mgr_id", m.emp_name "Manager"
FROM employees e, employees m
WHERE e.mgr_id = m.employee_id
AND e.salary > 4000;
What is its output?

A) Option C
B) Option A
C) Option B
D) Option D

4. Evaluate the SQL statement:
SELECT ROUND(45.953, -1), TRUNC(45.936, 2)
FROM dual;
Which values are displayed?

A) 50 and 45.9
B) 45 and 45.93
C) 46 and 45
D) 45.95 and 45.93
E) 50 and 45.93
F) 46 and 45.93

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

Solutions: