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Listing 8-45. Alternative Solution Without Using the MINUS Operator select DISTINCT o.location from offerings o where o.location not in (select d.location from departments d) Note that you must add a DISTINCT operator, to handle situations where you have multiple course offerings in the same location. As explained before, the MINUS operator automatically removes duplicate rows. Are the two queries in Listing 8-44 and 8-45 logically equivalent They appear to be logically the same, but they are not quite as identical logically as they first appear. The first query will return two rows. One is for Seattle. The other is a null, representing the one course offering with an unknown location. The MINUS operator does not remove the null value, whereas that same null value fails to pass the WHERE condition in Listing 8-45. This is just one more example of the subtle pitfalls inherent in dealing with nulls in your data. You can also produce outer join results by using the UNION operator. You will see how to do this in Listings 8-46 and 8-47. We start with a regular join in Listing 8-46. In Listing 8-47 you add the additional department(s) needed for the outer join with a UNION operator, while assigning the right number of employees for those departments: zero. Listing 8-46. Regular Join select , , from , where group by , DEPTNO -------10 20 30 d.deptno d.dname count(e.empno) as headcount employees e departments d e.deptno = d.deptno d.deptno d.dname; DNAME HEADCOUNT ---------- --------ACCOUNTING 3 TRAINING 5 SALES 6

Does the program have a short document such as that described in the Book Paradigm that gives an overall view of how the program is organized Is the purpose of each file described Are the author s name, email address, and phone number in the listing

Choosing an unpolished aesthetic style can be a savvy and sophisticated strategy at times. If everyone presents the same slick, polished, and awless style, everyone s presentations will look the same. If you choose something simple to contrast with the norm, you could break through the visual boredom and succeed at making a memorable impression. There is of course a risk that using a technique like this might not work if your audience expects the same aesthetics as they see everywhere else, so you would need to be con dent that you could make this choice work for both you and your audience.

The question of whether to comment is a legitimate one. Done poorly, commenting is a waste of time and sometimes harmful. Done well, commenting is worthwhile. The source code should contain most of the critical information about the program. As long as the program is running, the source code is more likely than any other resource to be kept current, and it s useful to have important information bundled with the code. Good code is its own best documentation. If the code is bad enough to require extensive comments, try first to improve the code so that it doesn t need extensive comments.

Listing 8-47. Expansion to an Outer Join with a UNION Operator select , , from , where group by , union d.deptno d.dname count(e.empno) as headcount employees e departments d e.deptno = d.deptno d.deptno d.dname

Comments should say things about the code that the code can t say about itself at the summary level or the intent level. Some commenting styles require a lot of tedious clerical work. Develop a style that s easy to maintain.

8

33.2 Intelligence and Humility 33.3 Curiosity 33.4 Intellectual Honesty 33.5 Communication and Cooperation 33.6 Creativity and Discipline 33.7 Laziness 33.8 Characteristics That Don t Matter As Much As You Might Think 33.9 Habits

x.deptno x.dname 0 as headcount departments x x.deptno not in (select y.deptno from employees y); DNAME HEADCOUNT ---------- --------ACCOUNTING 3 TRAINING 5 SALES 6 HR 0

3 CC2E.COM/ 3313

De nitely, the considerations of innate taste, talent, and skill come into play when you nd, create, or add graphics. You might nd that you are naturally good at nding graphics that align with the aesthetics of your audience. But you also might discover that your talents lie elsewhere if so, it s best to enlist the help of your coworkers or designers to help you nd the best graphics for the job, or use some of the professionally designed graphics created for BBP presentations that are available at www.beyondbulletpoints.com.

Related Topics Themes in software craftsmanship: 34