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DEPTNO COUNT(EMPNO) -------- -----------30 5 The WHERE condition regarding the day of birth (line 3) can be checked against individual rows of the EMPLOYEES table. On the other hand, the COUNT(*) condition (line 5) makes sense only at the group level. That s why group functions should never occur in a WHERE clause. They typically result in the following Oracle error message: ORA-00934: group function is not allowed here. You ll see this error message in Listing 8-29, caused by a classic SQL mistake, as discussed shortly.

that the units are obvious. To a new programmer, they won t be. To someone who s been working on another part of the system, they won t be. After the program has been substantially modified, they won t be.

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documenting allowable ranges of variables is to use assertions at the beginning and end of a routine to assert that the variable s values should be within a prescribed range. For more details, see Section 8.2, "Assertions."

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Now that you have a range of techniques in mind, start sketching the rest of your storyboard. Sketch each and every slide in the entire storyboard rst, even if you already have some nished graphics that you know you want to use that way you don t get caught up in the visual details of individual slides that prevent you from spending time on the rest of the slides. After you have a sketch for every slide in place, you ll review the entire storyboard in Slide Sorter view in 8 to assess how much time you have to add graphics, where you need to spend your time rst, what resources you have to get things done, and who you can ask for help if you need it. This process might seem challenging now, but the more you storyboard, the more skilled you ll become. Just as you do when you write the story template, it helps to bring in other people to collaborate with you on the storyboard. If you re using a Tablet PC, you can project the storyboard on a screen and sketch together; if you re using paper, you can tape printed copies of individual slides on the wall and collaborate that way. And just as you do when you verbally edit the story template, look for ways to visually edit, tighten, and improve your storyboard. When you have a fully sketched storyboard in hand, it s time to turn the sketches into nished graphics as you complete your nal PowerPoint storyboard in the next chapter.

On the other hand, valid HAVING clauses without group functions are very rare, and they should be rewritten. In Listing 8-28, the second query is much more efficient than the first one.

Comment the range of allowable numeric values If a variable has an expected range of values, document the expected range. One of the powerful features of the Ada programming language was the ability to restrict the allowable values of a numeric variable to a range of values. If your language doesn t support that capability (which most languages don t), use a comment to document the expected range of values. For example, if a variable represents an amount of money in dollars, indicate that you expect it to be between $1 and $100. If a variable indicates a voltage, indicate that it should be between 105v and 125v. Comment coded meanings If your language supports enumerated types as C++ and Visual Basic do use them to express coded meanings. If it doesn t, use comments to indicate what each value represents and use a named constant rather than a literal for each of the values. If a variable represents kinds of electrical current, comment the fact that 1 represents alternating current, 2 represents direct current, and 3 represents undefined.

Here s an example of documenting variable declarations that illustrates the three preceding recommendations: