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Management has asked you to calculate the value 12*salary* commission_pct for all the employees in the
EMP table. The EMP table contains these columns:
LAST NAME VARCNAR2(35) NOT NULL
SALARY NUMBER(9,2) NOT NULL
COMMISION_PCT NUMBER(4,2)
Which statement ensures that a value is displayed in the calculated columns for all employees?
A. SELECT last_name, 12*salary* commission_pct
FROM emp;
B. SELECT last_name, 12*salary* (commission_pct,0)
FROM emp;
C. SELECT last_name, 12*salary*(nvl(commission_pct,0))
FROM emp;
D. SELECT last_name, 12*salary*(decode(commission_pct,0))
FROM emp;
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Answer: C
Explanation:
This SELECT statement provides correct usage of NVL function to calculate columns for all employees. Oracle
give you possibility to substitute a value in place of NULL. The basic syntax for NVL() is NVL(column_name,
value_if_null). Notice that the column specified in NVL() contains an actual value. That value is what Oracle
returns; when the column is NULL, the special string is returned. The value
specified to be returned if the
column value is NULL must be the same datatype as the column specified.
Incorrect Answers
A: This SELECT statement will return NULL value for rows with NULL COMMISION_PCT column.
B: It is incorrect syntax in this query: NVL function needs to be used for correct result.
D: The DECODE function is used as substitution of IF-THEN-ELSE PL/SQL construction in SQL queries. The
SELECT statement provides incorrect syntax of it cannot have only two parameters.
OCP Introduction to Oracle 9i: SQL Exam Guide, Jason Couchman, p. 31-32
Chapter 1: Overview of Oracle Databases