Oracle 9i Developer OCA Oracle Certified Associate

Manage null values when using group functions in a SQL statement

The employee table contains these columns
First_Name VARCHAR2(25)
Last_Name VARCHAR2(25)
Evaluate these two SQL statements.
1. SELECT
Concat(first_name, last_name)
Length(concat(first_name, last_name)
FROM employee
WHERE UPPER (last_name) Like '%J'
OR UPPER (last_name) Like '%K';
2. SELECT INITCAP (first_name) || initcap (last_name),
Length (last_name) + Length (first_name)
FROM employee
WHERE INITCAP (SUBSTR (last_name, 1, 1)) IN
('J' , 'K' , 'L')
How will the results differ?

A. The statement will retrieve different data from the database.
B. The statement will retrieve the same data from the database, but will display it
differently.
C. Statement1 will execute but statement2 will not.
D. Statement2 will execute but statement1 will not.

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Answer: A

Explanation:
Answer A is correct because the statements will retrieve different data from the database.
First statement will show concatenated first and last names of EMPLOYEE TABLE and
also length of concatenated string for all rows in the table which have last_name with 'j',
'J', 'k' or 'K' on the end. Second statement will show concatenated first and last names
with the initial letter for each first and last name converted to a capital letter and also
summary length of first and last name for all rows which started from 'j', 'J', 'k', 'K', 'l' or
'L'.
Incorrect Answers:
B: Each statement will show different data from the database.
C: Both statements will execute successfully.
D: Both statements will execute successfully.
Oracle 8, DBA Certification Exam Guide, Jason S. Couchman, p. 6-10
Chapter 1: Selecting Data from Oracle