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Obviously, consistency is a first requirement for any information system, ensuring that you can retrieve reliable information from that system. In other words, you don t want any contradictions in your information system. For example, suppose we derive the following information from our training business information system: Attendee 6749 was born on February 13, 2093. The same attendee 6749 appears to have gender Z. There is another, different attendee with the same number 6749. We see a course registration for attendee 8462, but this number does not appear in the administration records where we maintain a list of all persons. In none of the above four cases is the consistency at stake; the information system is unambiguous in its statements. Nevertheless, there is something wrong because these statements do not conform to common sense. This brings us to the second requirement for an information system: data integrity. We would consider it more in accordance with our perception of reality if the following were true of our information system: For any course attendee, the date of birth does not lie in the future. The gender attribute for any person has the value M or F. Every course attendee (or person in general) has a unique number. We have registration information only for existing attendees that is, attendees known to the information system.

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20. Select Select RIGHT SWEEP 21. STOP 22. STOP 23. Select Select LEFT SWEEP 24. STOP Press P> to play back this advanced song and dance routine.

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These rules concerning database contents are called constraints. You should translate all your business rules into formal integrity constraints. The third example a unique number for each person is a primary key constraint, and it implements entity integrity. The fourth example information for only persons known to the system is a foreign key constraint, implementing referential integrity. We will revisit these concepts later in this chapter, in Section 1.5. Constraints are often classified based on the lowest level at which they can be checked. The following are four constraint types, each illustrated with an example: Attribute constraints: Checks attributes; for example, Gender must be M or F. Row constraints: Checks at the row level; for example, For salesmen, commission is a mandatory attribute. Table constraints: Checks at the table level; for example, Each employee has a unique e-mail address. Database constraints: Checks at the database level; for example, Each employee works for an existing department. In 7, we ll revisit integrity constraints to see how you can formally specify them in the SQL language. At the beginning of this section, you learned that information needs can be formalized by identifying which entities are relevant for the information system, and then deciding which attributes are relevant for each entity. Now we can add a third step to the information analysis list of steps to produce a formal data model: 1. Which entities are relevant for the information system 2. Which attributes are relevant for each entity 3. Which integrity constraints should be enforced by the system

In the app, you don t need the accelerometer, but if you need it in your creation, use the following code:

You can add methods to user-defined datatypes. Methods are operations specifically developed to work with your user-defined datatypes; for example, to specify how you want to compare two address type values, or how you want to sort address values. Methods add a lot of semantic power to your user-defined datatypes. Unfortunately we can t spend much time on methods in this book, because you need a great deal of PL/SQL programming to create methods. If you want to see some method examples, check out the CUSTOMERS table of the OE schema, one of the standard sample schemas that ships with the Oracle software. As you will see in the next section, as soon as you create a user-defined datatype in Oracle, you implicitly get one method for free a method with the same name as the datatype itself. That method is the constructor method, which allows you to create occurrences of the datatype.

This guide was the last to appear on the WowWee website, and was not included in Mark Tilden s original Website Content document. Among the serious Robosapien hacking community online, this guide drew some grumblings. The idea of using old toilet paper tubes to mod Robosapien was abhorrent to some of the people doing some of the advanced hacks, and also to those who had been anxiously awaiting the release of the latest Easter eggs. It seems like very few actually got the humor. In this section I have used all of the original pictures Mark Tilden took for the WowWee guide.7

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