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Oracle Introduction to Oracle9i: SQL Sample Questions:

1. The EMP table contains these columns:

You need to display the employees who have not been assigned to any department.
You write the SELECT statement:
SELECT LAST_NAME, SALARY, DEPARTMENT_ID
FROM EMP
WHERE DEPARTMENT_ID = NULL;
What is true about this SQL statement?

A) The operator in the WHERE clause should be changed to display the desired results.
B) The column in the WHERE clause should be changed to display the desired results.
C) The SQL statement displays the desired results.
D) The WHERE clause should be changed to use an outer join to display the desired results.

2. Which two are character manipulation functions? (Choose two.)

A) CASE
B) TO_DATE
C) MOD
D) TRUNC
E) TRIM
F) REPLACE

3. Examine the structure of the EMPLOYEES and NEW_EMPLOYEES tables:

Which DELETE statement is valid?

A) DELETE * FROM employees
WHERE employee_id IN (SELECT employee_id
FROM new_employees
WHERE name = 'Carrey');
B) DELETE FROM employees
WHERE employee_id IN (SELECT employee_id
FROM new_employees
WHERE name = 'Carrey');
C) DELETE * FROM employees
WHERE employee_id=(SELECT employee_id FROM new_employees);
D) DELETE FROM employees
WHERE employee_id = (SELECT employee_id FROM employees);

4. Evaluate the SQL statement:
SELECT LPAD (salary,10,'*')
FROM EMP
WHERE EMP_ID = 1001;
If the employee with the EMP_ID 1001 has a salary of 17000, what is displayed?

A) 17000.00
B) an error statement
C) ****170.00
D) 17000*****
E) **17000.00

5. Examine the SQL statement that creates ORDERS table:
CREATE TABLE orders (SER_NO NUMBER UNIQUE, ORDER_ID NUMBER, ORDER_DATE DATE NOT NULL, STATUS VARCHAR2(10) CHECK (status IN ('CREDIT', 'CASH')), PROD_ID NUMBER REFERENCES PRODUCTS(PRODUCT_ID), ORD_TOTAL NUMBER, PRIMARY KEY (order_id, order_date));
For which columns would an index be automatically created when you execute the above SQL statement? (Choose two.)

A) PROD_ID
B) ORD_TOTAL
C) composite index on ORDER_ID and ORDER_DATE
D) SER_NO
E) STATUS
F) ORDER_ID

Solutions: