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11i/2.6 Implement Oracle Workflow
Oracle Training Perform Flashback table operation
The EMPLOYEE tables has these columns:
LAST_NAME VARCHAR2(35)
SALARY NUMBER(8,2)
COMMISSION_PCT NUMBER(5,2)
You want to display the name and annual salary multiplied by the commission_pct for all employees. For
records that have a NULL commission_pct, a zero must be displayed against the calculated column.
Which SQL statement displays the desired results?
A. SELECT last_name, (salary * 12) * commission_pct
FROM EMPLOYEES;
B. SELECT last_name, (salary * 12) * IFNULL(commission_pct, 0)
FROM EMPLOYEES;
C. SELECT last_name, (salary * 12) * NVL2(commission_pct, 0)
FROM EMPLOYEES;
D. SELECT last_name, (salary * 12) * NVL(commission_pct, 0)
FROM EMPLOYEES;
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Answer: D
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 in 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: There is no IFNULL() function in Oracle.
C: The NVL2() function requires 3 parameters, not 2. Function NVL2(expr1, expr2, expr3) returns expr2 if
expr1 is not NULL. If expr1 is NULL, it returns expr3.
OCP Introduction to Oracle 9i: SQL Exam Guide, Jason Couchman, p. 31-32
Chapter 1: Overview of Oracle Databases