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Oracle Database 10g Administrator

Oracle Exams Training Explain the benefits of Optimal Flexible Architecture

The employee table contains these columns:
FIRST-NAME VARCHER2(25)
COMISSION NUMBER(3,2)
Evaluate this SQL statement
SELECT first-name,commission
FROM employee
WHERE commission=
(SELECTcomission
FROM employee
WHERE UPPER(first-name)= 'scott')
Which statement will cause this statement to fail?

A. Scott has a null commission resolution.
B. Scott has a zero commission resolution.
C. There is no employee with the first name Scott.
D. The first name values in the data base are in the lower case.

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Answer: A

Explanation:
Answer A is correct because if Scott has a null commission expression
in WHERE clause will cause error.
Incorrect Answers:
B: Query will work correctly.
C: Query will work even without employee with the first name Scott.
D: Name values will be converted to upper case by function UPPER, query will work,
but for correct result you need to change UPPER to LOWER function.
Oracle 8, DBA Certification Exam Guide, Jason S. Couchman, p. 64
Chapter 2: Advanced Data Selection in Oracle