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Oracle Training Use Automatic PGA Memory Management

The CUSTOMERS table has these columns:
CUSTOMER_ID NUMBER(4) NOT NULL
CUSTOMER_NAME VARCHAR2(100) NOT NULL
STREET_ADDRESS VARCHAR2(150)
CITY_ADDRESS VARCHAR2(50)
STATE_ADDRESS VARCHAR2(50)
PROVINCE_ADDRESS VARCHAR2(50)
COUNTRY_ADDRESS VARCHAR2(50)
POSTAL_CODE VARCHAR2(12)
CUSTOMER_PHONE VARCHAR2(20)
Which statement finds the rows in the CUSTOMERS table that do not have a postal code?

A. SELECT customer_id, customer_name
FROM customers
WHERE postal_code CONTAINS NULL;
B. SELECT customer_id, customer_name
FROM customers
WHER postal_code = ' ___________';
C. SELECT customer_id, customer_name
FROM customers
WHERE postal _ code IS NULL;
D. SELECT customer_id, customer_name
FROM customers
WHERE postal code IS NVL;
E. SELECT customer_id, customer_name
FROM customers
WHERE postal_code = NULL;

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Answer: C

Explanation:
This statement returns the rows in the CUSTOMERS table that do not have a postal code. The correct syntax to
check NULL values is usage of "IS NULL" clause.
Incorrect Answers
A: "CONTAINS NULL" is incorrect clause in Oracle.
B: This satement will just check if postal code equals to string'____________';
D: Usage of "IS NVL" is incorrect in Oracle. But there is a function NVL() you can use to process NULL
values.
E: You can not use equal comparison to check whether value is NULL or not. Use construction "IS NULL" or
"IS NOT NULL" to do that.
OCP Introduction to Oracle 9i: SQL Exam Guide, Jason Couchman, p. 31-32
Chapter 1: Overview of Oracle Databases