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The new ANSI/ISO outer join syntax is much more elegant and readable. Listing 8-13 shows the version to get the same results as in Listing 8-12. Listing 8-13. ANSI/ISO Outer Join Example select deptno, d.location , e.ename, e.init from employees e right outer join departments d using (deptno) order by deptno, e.ename; DEPTNO -------10 10 10 20 20 20 20 20 30 30 30 30 30 30 40 LOCATION -------NEW YORK NEW YORK NEW YORK DALLAS DALLAS DALLAS DALLAS DALLAS CHICAGO CHICAGO CHICAGO CHICAGO CHICAGO CHICAGO BOSTON ENAME -------CLARK KING MILLER ADAMS FORD JONES SCOTT SMITH ALLEN BLAKE JONES MARTIN TURNER WARD INIT ----AB CC TJA AA MG JM SCJ N JAM R R P JJ TF

Releasing defective code to customers is bad enough; releasing code that you knew was defective is even worse. I have found that standardizing the style of marker comments is helpful. If you don t standardize, some programmers will use *******, some will use !!!!!!, some will use TBD, and some will use various other conventions. Using a variety of notations makes mechanical searching for incomplete code error prone or impossible. Standardizing on one specific technique such as using TBD allows you to do a mechanical search for incomplete sections of code as one of the steps in a release checklist, which avoids the FIX BEFORE RELEASE!!! problem.

A comment that summarizes code does just that: It distills a few lines of code into one or two sentences. Such comments are more valuable than comments that merely repeat the code because a reader can scan them more quickly than the code. Summary comments are particularly useful when someone other than the code s original author tries to modify the code.

FIGURE 1-7 Next the words CSI: Angleton appeared on the screen as Mark told jurors that they would be

A comment at the level of intent explains the purpose of a section of code. Intent comments operate more at the level of the problem than at the level of the solution. For example,

In Listing 8-13 we used a RIGHT OUTER JOIN, because we suspect the presence of rows at the righthand side (the DEPARTMENTS table) without corresponding rows at the left-hand side (the EMPLOYEES table). If you switched the two table names in the FROM clause, you would need the LEFT OUTER JOINoperator. Oracle also supports the FULL OUTER JOIN syntax, where both tables participating in the join operation handle rows without corresponding rows on the other side in a special way. Figure 8-4 shows all three outer join syntax possibilities. The outer join operator is especially useful if you want to aggregate (summarize) data; for example, when you want to produce a course overview showing the number of attendees for each scheduled course. In such an overview, you obviously also want to see all scheduled courses for which no registrations are entered yet, so you might consider cancelling or postponing those courses. This type of query (with aggregation) is the topic of Section 8.5.

is a summary comment in terms of the solution. A six-month study conducted by IBM found that maintenance programmers most often said that understanding the original programmer s intent was the most difficult problem (Fjelstad and Hamlen 1979). The distinction between intent and summary comments isn t always clear, and it s usually not important. Examples of intent comments are given throughout the chapter. The only two kinds of comments that are acceptable for completed code are intent and summary comments.

like crime scene investigators, sorting through the evidence to figure out what caused Bob s death.

Effective commenting isn t that time-consuming. Too many comments are as bad as too few, and you can achieve a middle ground economically. Comments can take a lot of time to write for two common reasons. First, the commenting style might be time-consuming or tedious a pain in the neck. If it is, find a new style. A commenting style that requires a lot of busy work is a maintenance headache: If the comments are hard to change, they won t be changed; they ll become inaccurate and misleading, which is worse than having no comments at all. Second, commenting might be difficult because the words to describe what the program is doing don t come easily. That s usually a sign that you don t really understand what the program does. The time you spend commenting is really time spent understanding the program better, which is time that needs to be spent regardless of whether you comment.