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Oracle Database 10g: SQL Fundamentals I
Oracle Training Recover from user errors using Flashback versions query
Evaluate the SQL statement:
1 SELECT a.emp_name, a.sal, a.dept_id, b.maxsal
2 FROM employees a,
3 (SELECT dept_id, MAX(sal) maxsal
4. FROM employees
5 GROUP BY dept_id) b
6 WHERE a.dept_id = b.dept_id
7 AND a. asl < b. maxsal;
What is the result of the statement?
A. The statement produces an error at line 1.
B. The statement produces an error at line 3.
C. The statement produces an error at line 6.
D. The statement returns the employee name, salary, department ID, and maximum salary earned in the
department of the employee for all departments that pay less salary then the maximum salary paid in the
company.
E. The statement returns the employee name, salary, department ID, and maximum salary earned in the
department of the employee for all employees who earn less than the maximum salary in their department.
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Answer: E
Explanation:
The statement returns the employee name, salary, department ID, and maximum salary earned in the department
of the employee for all employees who earn less than the maximum salary in their department. This query is
example of an inline view which is the sub-query in the FROM clause of the main query. The sub-query can be
a SELECT statement that utilizes joins, the GROUP BY clause, or the ORDER BY clause.
Incorrect Answers
A: The statement does not produce an error at line 1.
B: The statement does not produce an error at line 3.
C: The statement does not produce an error at line 6.
D:
The statement returns the employee name, salary, department ID, and maximum salary earned in the
department of the employee for all EMPLOYEES, NOT DEPARTMENTS, who earn less than the maximum
salary in their department.
OCP Introduction to Oracle 9i: SQL Exam Guide, Jason Couchman, p. 161-165
Chapter 4: Subqueries