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Oracle Introduction to Oracle9i: SQL Sample Questions:

1. EMPLOYEES and DEPARTMENTS data:

On the EMPLOYEES table, EMPLOYEE_ID is the primary key. MGR_ID is the ID
managers and refers to the EMPLOYEE_ID.
On the DEPARTMENTS table DEPARTMENT_ID is the primary key.
Evaluate this UPDATE statement.
UPDATE employees
SET mgr_id =
(SELECT mgr_id
FROM employees
WHERE dept_id=
(SELECT department_id
FROM departments
WHERE department_name = 'Administration')),
Salary = (SELECT salary
FROM employees
WHERE emp_name = 'Smith')
WHERE job_id = 'IT_ADMIN';
What happens when the statement is executed?

A) The statement executes successfully, changes the manager ID to NULL, and changes the salary to 3000 for the employees with ID 103 and 105.
B) The statement executes successfully, changes the manager ID to NULL, and changes the salary to 4000 for the employees with ID 103 and 105.
C) The statement fails because there is no 'Administration' department in the DEPARTMENTS table.
D) The statement fails because there is more than one row matching the employee name Smith.
E) The statement fails because there is more than one row matching the IT_ADMIN job ID in the EMPLOYEES table.
F) The statement executes successfully, leaves the manager ID as the existing value, and changes the salary to 4000 for the employees with ID 103 and 105.

2. Examine the structure of the EMPLOYEES and NEW_EMPLOYEES tables:
EMPLOYEES
EMPLOYEE_ID NUMBER Primary Key
FIRST_NAME VARCHAR2(25)
LAST_NAME VARCHAR2(25)
HIRE_DATE DATE
NEW_EMPLOYEES
EMPLOYEE_ID NUMBER Primary Key
NAME VARCHAR2(60)
Which MERGE statement is valid?

A) MERGE new_employees c FROM employees e ON (c.employee_id = e.employee_id) WHEN MATCHED THEN UPDATE SET
B) name = e.first_name ||','|| e.last_name WHEN NOT MATCHED THEN INSERT value S(e.employee_id, e.first_name ||', '||e.last_name);
C) name = e.first_name ||','|| e.last_name WHEN NOT MATCHED THEN INSERT value S(e.employee_id, e.first_name ||', '||e.last_name);
D) name = e.first_name ||','|| e.last_name WHEN NOT MATCHED THEN INSERT valueS(e.employee_id, e.first_name ||', '||e.last_name);
E) MERGE INTO new_employees c USING employees e ON (c.employee_id = e.employee_id) WHEN MATCHED THEN UPDATE SET
F) MERGE INTO new_employees cUSING employees e ON (c.employee_id = e.employee_id) WHEN EXISTS THEN UPDATE SET
G) MERGE new_employees c USING employees e ON (c.employee_id = e.employee_id) WHEN EXISTS THEN UPDATE SET
H) name = e.first_name ||','|| e.last_name WHEN NOT MATCHED THEN INSERT INTO new_employees valueS(e.employee_id, e.first_name ||', '||e.last_name);

3. You need to perform certain data manipulation operations through a view called EMP_DEPT_VU, which you previously created.
You want to look at the definition of the view (the SELECT statement on which the view was create.)
How do you obtain the definition of the view?

A) Use the DEFINE VIEW command on the EMP_DEPT VU view.
B) Use the DESCRIBE command in the EMP_DEPT VU view.
C) Use the DESCRIBE VIEW command on the EMP_DEPT VU view.
D) Query the USER_OBJECTS data dictionary view to search for the EMP_DEPT_VU view.
E) Query the USER_SOURCE data dictionary view to search for the EMP_DEPT_VU view.
F) Query the USER_VIEWS data dictionary view to search for the EMP_DEPT_VU view.

4. Examine the data from the ORDERS and CUSTOMERS table.

Which SQL statement retrieves the order ID, customer ID, and order total for the orders that are placed on the same day that Martin places his orders?

A) SELECT ord_id, cust_id, ord_total
FROM orders, customers
WHERE cust_name='Mating'
AND ord_date IN ('18-JUL-2000','21-JUL-2000');
B) SELECT ord_id, cust_id, ord_total FROM orders Where ord_date IN (SELECT ord_date FROM orders, customers Where cust_name = 'Martin');
C) SELECT ord_id, cust_id, ord_total FROM orders Where ord_date IN (SELECT ord_date FROM orders WHERE cust_id = (SELECT cust_id FROM customers WHERE cust_name = 'Martin'));
D) SELECT ord_id, cust_id, ord_total FROM orders WHERE cust_id IN (SELECT cust_id FROM customers WHERE cust name = 'Martin');

5. Which is an iSQL*Plus command?

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

Solutions: