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The improvement with if-then-elses is more consistent than it was with the case statements, but that s a mixed blessing. In C# and VB both versions of the case statement approach are faster than both versions of the if-then-else approach, whereas in Java both versions are slower. This variation in results suggests a third possible optimization, described in the next section.

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Listing 4-8 shows two examples of DUAL table usage. Note that the contents of this DUAL table are totally irrelevant; you use only the property that the DUAL table contains a single row. Listing 4-8. Using the DUAL Table select 123 * 456 from dual; 123*456 -------56088 select sysdate from dual; SYSDATE ----------05-SEP-2004 The second query in Listing 4-8 shows an example of using the system date. You can refer to the system date in Oracle with the keyword SYSDATE. Actually, to be more precise, SYSDATE is a function that returns the system date. These functions are also referred to as pseudo columns. See Appendix A of this book for examples of other such pseudo columns. Listing 4-9 shows an example of using SYSDATE to derive the age of an employee, based on the date of birth stored in the BDATE column of the EMPLOYEES table. Listing 4-9. Using the System Date select ename, (sysdate-bdate)/365 from employees where empno = 7839; ENAME (SYSDATE-BDATE)/365 -------- ------------------KING 51.83758

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The test described above could be performed using either a case statement or ifthen-elses. Depending on the environment, either approach might work better. Here is the data from the preceding two tables reformatted to present the codetuned times comparing if-then-else and case performance:

After you nish applying custom layouts, the slides of your storyboard should appear as shown in Figure 8-19. Now that you have custom layouts in place, you have a foundation for the graphics that you will add to individual slides next.

if-thenelse 0.330 0.460 1.00 Time Savings -27% 82% 258% Performance Ratio 1:1 6:1 1:4

Note The results of your queries using SYSDATE depend on the precise moment the command was run; therefore, when you execute the examples, the results will not be the same as those shown in Listings 4-8 and 4-9.

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These results defy any logical explanation. In one of the languages, case is dramatically superior to if-then-else, and in another, if-then-else is dramatically superior to case. In the third language, the difference is relatively small. You might think that because C# and Java share similar syntax for case statements, their results would be similar, but in fact their results are opposite each other. This example clearly illustrates the difficulty of performing any sort of rule of thumb or logic to code tuning there is simply no reliable substitute for measuring results.

In some circumstances, a table lookup may be quicker than traversing a complicated chain of logic. The point of a complicated chain is usually to categorize something and then to take an action based on its category. As an abstract example, suppose you want to assign a category number to something based on which of Groups A, B, and C it falls into:

FIGURE 8-19 Examples of Key Point, Explanation, and Detail slides with the corresponding custom layouts

You should always consider the possibility of null values occurring in expressions. In case one or more variables in an expression evaluate to a null value, the result of the expression as a whole becomes unknown. We will discuss this area of concern in more detail later in this chapter, in Section 4.9. As an appetizer, look at the result of the query in Listing 4-10. Listing 4-10. The Effect of Null Values in Expressions select ename, msal, comm, 12*msal + comm from employees where empno < 7600; ENAME MSAL COMM 12*MSAL+COMM -------- -------- -------- -----------SMITH 800 ALLEN 1600 300 19500 WARD 1250 500 15500 JONES 2975 As you can see, the total yearly salary (including commission) for two out of four employees is unknown, because the commission column of those employees contains a null value.

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With the WHERE clause, you can specify a condition to filter the rows for the result. We distinguish simple and compound conditions. Simple conditions typically contain one of the SQL comparison operators listed in Table 4-2. Table 4-2. SQL Comparison Operators

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