Oracle Exam features of materialized views - mcsaclass.com

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Oracle Exam features of materialized views

The employee table contains these columns.
LAST_NAME VARCHAR2(25) FIRST_NAME VARCHAR2(25) DEPT_ID
NUMBER(9)
You need to display the names of the employees that are not assigned to the
department. Evaluate this SQL statement.
SELECT last_name, first_nameFROM employee
WHERE dept_id is NULL
Which change should you make to achieve the desired result?

A. Create an outer join.
B. Change the column in the where condition.
C. Change the operator in the where condition
D. Add a second condition to the where condition

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Answer: C

Explanation:
Answer C is correct because the NULL operator need to be changed in
the WHERE condition to display correct result.
Incorrect Answers:
A: One table is used for query, so there is no reason to use outer join operation.
B: The column in the WHERE condition is correct and don't need to be changed.
D: Query does not require additional condition to extract correct data.
Oracle 8, DBA Certification Exam Guide, Jason S. Couchman, p. 10-11
Chapter 1: Selecting data from Oracle