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Oracle Introduction to Oracle9i: SQL Sample Questions:

1. Examine the structure of the EMPLOYEES, DEPARTMENTS, and LOCATIONS tables.

Which two SQL statements produce the name, department name, and the city of all the employees who earn more then 10000? (Choose two)

A) SELECT emp_name, department_name, city
FROM employees e
JOIN departments d
USING (department_id)
JOIN locations 1
USING (location_id)
WHERE salary > 10000;
B) SELECT emp_name, department_name, city FROM employees e, departments d, locations 1 WHERE e.department_id = d.department_id AND d.location_id = 1.location_id AND salary > 10000;
C) SELECT emp_name, department_name, city
FROM employees e, departments d, locations 1
WHERE salary > 10000;
D) SELECT emp_name, department_name, city
FROM employees e, departments d, locations 1
JOIN ON (e.department_id = d.department id)
AND (d.location_id =1.location_id)
AND salary > 10000;
E) SELECT emp_name, department_name, city FROM employees e NATURAL JOIN departments, locations WHERE salary > 10000;

2. What does the TRUNCATE statement do?

A) Removes all rows from a table
B) Removes all columns from a table
C) Removes foreign keys from a table
D) Shortens the table to 10 rows
E) Removes the table

3. Which SELECT statement should you use to extract the year from the system date and display it in the format "1998"?

A) SELECT TO_CHAR(SYSDATE,'yyyy') FROM dual;
B) SELECT TO_DATE(SYSDATE,'yyyy') FROM dual;
C) SELECT TO_CHAR(SUBSTR(SYSDATE, 8,2),'yyyy') FROM dual;
D) SELECT DECODE(SUBSTR(SYSDATE, 8), 'YYYY') FROM dual;
E) SELECT DECODE(SUBSTR(SYSDATE, 8), 'year') FROM dual;

4. The ORDERS table has these columns:

The ORDERS table tracks the Order number, the order total, and the customer to whom the Order belongs. Which two statements retrieve orders with an inclusive total that ranges between 100.00 and 2000.00 dollars? (Choose two.)

A) SELECT customer_id, order_id, order_total FROM orders WHERE order_total >= 100 and order_total <= 2000;
B) SELECT customer_id, order_id, order_total FROM orders WHERE order_total BETWEEN 100 and 2000;
C) SELECT customer_id, order_id, order_total FROM orders RANGE ON order_total (100 AND 2000) INCLUSIVE;
D) SELECT customer_id, order_id, order_total FROM orders HAVING order_total BETWEEN 100 and 2000;
E) SELECT customer_id, order_id, order_total FROM orders WHERE order_total >= 100 and <= 2000;

5. Which three statements about subqueries are true? (Choose three)

A) A multiple row subquery can retrieve multiple rows and multiple columns.
B) A single row subquery can retrieve only one column and one row.
C) A multiple row subquery can use the "=" operator.
D) A single row subquery can retrieve only one row but many columns.
E) A single row subquery can use the IN operator.
F) A multiple row subquery can be compared by using the ">" operator.

Solutions: