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Identify options for managing an item hierarchy

The employee table contains these columns:
Last_name Varchar2 (25)
First_name Varchar2 (25)
Salary Number7, 2
You need to display the names of employees on more than an average salary of all
employees. Evaluate the SQL statement.
SELECT LAST_NAME, FIRST_NAME from employee where salary<avg(salary);
Which change should you make to achieve the desired results?

A. Change the function in the Where clause.
B. Move the function to the select clause and add a group clause.
C. Use a sub query in the where clause to compare the average salary value.
D. Move the function to the select clause and add a group by clause and a having clause.

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Answer: C

Explanation:
Answer C shows the correct way to change query, because function
AVG can not be used in WHERE clause.
Incorrect Answers:
A: Usage of function AVG is correct
B: This query does not require grouping to extract correct information from the table.
D: This query does not require to use GROUP BY and HAVING clauses to extract
correct information from table
Oracle 8, DBA Certification Exam Guide, Jason S. Couchman, p. 57
Chapter 2: Advanced Data Selection in Oracle