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What exactly is this thing called data modeling Simply put, data modeling is the process of figuring out how to store digitized information in a logically structured computer database It may sound easy, but a lot goes into the process of developing a sound data model Data modeling is a technical process that involves understanding and mapping business information to logical objects that can eventually be stored in a database This means that a data modeler must wear many hats to do the job effectively You not only must understand the process by which the model is built, but you also must be a data detective You must be good at asking questions and finding out what is really important to your customer In data modeling, as in many areas of information technology, customers know what they want, but they don t always know what they need It s your job to figure out what they need Suppose you re dealing with Tom, a project manager for an appliance distribution company Tom understands that his company orders refrigerators, dishwashers, and the like from the manufacturers and then takes orders and sells those appliances to its customers (retail stores) What Tom doesn t know is how to take that information, model it, and ultimately store it in a database so that it can be leveraged to help the company make decisions or control a process In addition to finding out what information your customer cares about and getting it into a database, you must find out how the customer intends to use the information Is it for historical purposes, or will the company use the data in its daily operations Will it be used only to produce reports, or will an application need to manipulate the data regularly As if that weren t enough, you eventually have to think about turning your data model into a physical database There are many choices on the market when it comes to database management products These products are similar in that they allow you to store, secure, and use information in databases; however, each product implements features in its own way, so you must also make the best use of.

Dim oUser Set oUser = GetObject("LDAP://cn=DonJ,ou=MIS,dc=domain,dc=com")

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In addition to the data types we have described, SQL Server allows you to create user-defined data types With user-defined data types, you can create standard columns for use in your tables When defining userdefined data types, you still must use the standard data types that we have described here as a base A user-defined data type is really a fixed definition of a data type, complete with length, precision, or scale as applicable For example, if you need to store phone numbers in various tables in your database, you can create a phone number data type If you create the

Dim oUser Set oUser = GetObject("LDAP://cn=DonJ,ou=MIS,dc=domain,dc=com") oUserPut "description", "Author" oUserSetInfo

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This chapter introduces the Sound API of MIDP 20 In the first version of the MIDP Specification, sound support was minimal With the release of the MIDP Specification version 20, this area has now been significantly enhanced A well-defined, scalable architecture for sound and multimedia has been created for devices running J2ME, with primary emphasis on mobile phones using the Mobile Information Device Profile In addition to offering basic sound programming support in MIDP 20, an optional package called the Mobile Media API has been created to enable generic multimedia functionality A diverse set of applications will benefit from sound and media support in J2ME devices Examples of such applications include games, speech, and multimedia applications

phone number data type as a varchar(25), then every column that you define as a phone number will be exactly the same, a varchar(25) As you recall from the discussion of domains in 2, user-defined data types are the physical implementation of domains in SQL Server We highly recommend using user-defined data types for consistency, both during the initial development and later during possible additions to your data model

The purpose of this chapter is to give the reader an overview of the MIDP 20 Sound API and the complementary optional package, the Mobile Media API (MMAPI), created by the Java Community Process effort JSR 135 [ Team LiB ]

Keep in mind that users in particular offer a number of multivalued attributes I discussed how to work with those in 14 Here's quick refresher

We discussed referential integrity (RI) in 2 Now we look specifically at how you implement referential integrity in a physical database In general, data integrity is the concept of keeping your data consistent and helping to ensure that your data is an accurate representation of the real world and that it is easy to retrieve There are various kinds of integrity; referential integrity ensures that the relationships between tables are adhered to when you insert or update data For example, suppose you have two tables: one called Employee and one called Vehicle You require that each vehicle be assigned to an employee; this is done via a relationship, and the rule is maintained with RI You physically implement this relationship using primary and foreign keys

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Dim objUser Set objUser = GetObject("cn=DonJ,ou=Sales,dc=braincore,dc=net") objUserPutEx MVP_APPEND, "otherTelephone", Array("555-1212") objUserSetInfo

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