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Oracle Database 11g Administrator

Oracle Exams Training Describe the structures involved in connecting a user to an Oracle instance

You want to display the details of all employees whose last names
is Smith. But you are not sure in which case last names are stored. Which statement
will list all the employees whose last name is Smith?

A. Select last name, first name.
FROM emp
WHERE last name= 'smith';
B. Select last name, first name.
FROM emp
WHERE UPPER (last name)= 'smith';
C. Select last name, first name.
FROM emp
WHERE last name=UPPER ('smith');
D. Select last name, first name.
FROM emp
WHERE LOWER (last name)= 'smith';

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Answer: D

Explanation:
Select last name, first name.
FROM emp
WHERE LOWER (last name)= 'smith'
Answer D shows all records with last name Smith because function LOWER returns the
column value passed as x into all lowercase
Incorrect Answers:
A: This command will show only records with last name 'smith'.
B: Command UPPER converts all data in last_name column into uppercase.
C: This command will show only records with last name 'SMITH'.
Oracle 8, DBA Certification Exam Guide, Jason S. Couchman, p. 22
Chapter 1: Selecting Data from Oracle