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Figure 3-2. Column specification syntax diagram Each column specification starts with a column name, followed by the datatype (discussed in the next section). If you add the optional expression NOT NULL to a column definition, each future row of the table you are creating must have a value specified for this column, and you will not be able to update future rows by removing a value for this column. In other words, you define the column to be a mandatory attribute. The NOT NULL addition is an example of a constraint. You can specify many additional constraints in the CREATE TABLE command. The other types of constraints are UNIQUE, CHECK, PRIMARY KEY, and FOREIGN KEY. 7 will discuss these options of the CREATE TABLE command.

In short, premature optimization s primary drawback is its lack of perspective. Its victims include final code speed, performance attributes that are more important than code speed, program quality, and ultimately the software s users. If the development time saved by implementing the simplest program is devoted to optimizing the running program, the result will always be a faster-running program than one in which optimization efforts have been exerted indiscriminately as the program was developed (Stevens 1981). In an occasional project, post-hoc optimization won t be sufficient to meet performance goals, and you ll have to make major changes in the completed code. In those cases, small, localized optimizations wouldn t have provided the gains needed anyway. The problem in such cases isn t inadequate code quality it s inadequate software architecture.

Some of the most powerful examples of Act I story structure pass right before your eyes every day. If you look for them, you ll nd an endless stream of ideas for your presentations. These stories are all around us in the form of advertising. Advertisers are well aware of Aristotle s ideas and techniques of storytelling and persuasion, because at its essence, every advertisement is a persuasive story. Whether you look up at a billboard, open a magazine, or watch television, you re seeing a ministory built on the fundamentals of persuasion. Each advertisement has a singular goal in mind: to persuade you to do something usually, to buy a product. To persuade you, an advertiser will use the most current and sophisticated blend of multimedia possible. But beneath the media mix are the same classical story elements you ve been working with in Act I of the story template: the clarifying questions where and when, who, why, what, and how. As in a PowerPoint presentation, the main character of an advertisement is usually the audience in this case, you because the advertiser s goal is to persuade you to buy or think something new. So if you re watching a commercial for a laundry detergent, you can compare the questions your audience silently asks of your ve Act I headlines with what you see on TV, something like this: Where am I, and when is it I m at home, and it s the afternoon. Who am I here in this setting I m a person getting ready to go out for the evening.

If you need to optimize before a program is complete, minimize the risks by building perspective into your process. One way is to specify size and speed goals for features and then optimize to meet the goals as you go along. Setting such goals in a specification is a way to keep one eye on the forest while you figure out how big your particular tree is.

Oracle supports many standard datatypes, as you will see if you take a look at the Oracle documentation. Some Oracle datatypes look very similar; some are even synonyms for each other. These datatypes are supported for compatibility purposes of Oracle with other DBMSs or with the ANSI/ISO SQL standard. For example, INT and INTEGER are synonyms for NUMBER(38). Some datatypes are very specific in nature, making them irrelevant for us at this point in time. This section covers only the most common and widely used Oracle datatypes. In general, there are three categories of column data: numbers (numeric data), text (alphanumeric data), and time-related data. The most important corresponding Oracle datatypes are NUMBER, VARCHAR or VARCHAR2, and DATE, respectively. Table 3-1 shows some examples of the NUMBER datatype. Table 3-1. NUMBER Datatype Examples

enlightening anecdotes, see Gerald Weinberg s Psychol1 ogy of Computer Program2 ming (1998).

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