Can this subquery be reduced to one line?

I'm learning SQL from Carolyn and Jack Hursch's book Oracle SQL Developer's Guide for version 6.0 (published by Windcrest/McGraw-Hill).

On page 90, there is an example for a subquery that "list all salesman in your Employees Table whose commission is greater than $800." The subquery they give is

	SELECT      employee_name, title, commission
	FROM	    Employees
	WHERE	    employee_name IN
		(SELECT employee_name
			FROM Employees
			WHERE commission > 800
			AND  title = 'salesman');

Couldn't this be simplified as
	SELECT employee_name, title, commission
	FROM Employees
	WHERE commission > 800
	AND title = 'salesman';

Are they not equivalent?

I just ran a test case in SQL*plus and I got the same results (tho' in different orders, which is understandable). I've been staring at this all afternoon. Am I missing something?

Are there any comments on the book? Better books? I'm also using C.J. Dates Vol I of An Introduction to Database Systems (Fourth Ed) and the 1st edition of Database Systems Concepts by Korth & Silberschatz to learn SQL concepts.

Thanks in advance!

-- 
--Ron
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   Ron Lee of CCS Operational Networks	| Naval Research Lab (Code 5592)
   Email:  lee_at_grizzly.nrl.navy.mil	| 4555 Overlook Avenue, S.W.
   Phone:  202-767-3903 		| Washington DC 20375

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