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Oracle Introduction to Oracle9i: SQL Sample Questions:

1. Examine the data in the EMPLOYEES table:

Which three subqueries work? (Choose three)

A) SELECT *
FROM employees
where salary > (SELECT MIN(salary)
FROM employees
GROUP BY department.id);
B) SELECT distinct department_id
FROM employees
Where salary > ANY (SELECT AVG(salary)
FROM employees
GROUP BY department_id);
C) SELECT department_id
FROM employees
WHERE salary > ALL (SELECT AVG(salary)
FROM employees
GROUP BY AVG(SALARY));
D) SELECT last_name
FROM employees
Where salary > ANY (SELECT MAX(salary)
FROM employees
GROUP BY department_id);
E) SELECT *
FROM employees
WHERE salary = (SELECT AVG(salary)
FROM employees
GROUP BY department_id);
F) SELECT department_id
FROM employees
WHERE SALARY > ALL (SELECT AVG(salary)
FROM employees
GROUP BY department_id);

2. User Mary has a view called EMP_DEPT_LOC_VU that was created based on the EMPLOYEES, DEPARTMENTS, and LOCATIONS tables. She has the privilege to create a public synonym, and would like to create a synonym for this view that can be used by all users of the database.
Which SQL statement can Mary use to accomplish that task?

A) CREATE PUBLIC SYNONYM EDL_VU ON emp_dept_loc_vu FOR ALL USERS;
B) CREATE SYNONYM EDL_VU ON emp_dept_loc_vu FOR EACH USER;
C) CREATE PUBLIC SYNONYM EDL:VU FOR mary (emp_dept_loc_vu);
D) CREATE SYNONYM EDL_VU FOR EACH USER ON emp_dept_loc_vu;
E) CREATE PUBLIC SYNONYM EDL_VU FOR emp_dept_loc_vu;
F) CREATE PUBLIC SYNONYM EDL_VU ON emp_dept_loc_vu;

3. 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) * NVL(commission_pct, 0) FROM EMPLOYEES;
C) SELECT last_name, (salary * 12) * IFNULL(commission_pct, 0) FROM EMPLOYEES;
D) SELECT last_name, (salary * 12) * commission_pct FROM EMPLOYEES;

4. Which is an iSQL*Plus command?

A) INSERT
B) UPDATE
C) DESCRIBE
D) RENAME
E) SELECT
F) DELETE

5. Examine the structure of the EMPLOYEES table:
EMPLOYEE_ID NUMBER Primary Key FIRST_NAME VARCHAR2(25) LAST_NAME VARCHAR2(25)
Which three statements inserts a row into the table? (Choose three)

A) INSERT INTO employees (employee_id, first_name, last_name) VALUES ( 1000, 'John','');
B) INSERT INTO employees (employee_id) VALUES (1000);
C) INSERT INTO employees(first_name,last_name, employee_id) VALUES ( 1000, 'John','Smith');
D) INSERT INTO employees VALUES ( NULL, 'John','Smith');
E) INSERT INTO employees VALUES ('1000','John',NULL);
F) INSERT INTO employees( first_name, last_name) VALUES('John','Smith');

Solutions: