By John Petersen
Absolute Beginner's consultant to Databases brings the weather of a database jointly utilizing effortless to appreciate language, ideal for the real newbie. It not just provides particular arms on perform, but in addition presents an summary of designing, keeping and utilizing a database. This booklet covers what databases are used for, why databases are vital, why the layout of the database is necessary, database normalization, keys to strong database layout, modifications in forms of databases, and indexes--what they're, how we use them, and why they're important.
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30 ABSOLUTE BEGINNER’S GUIDE TO DATABASES Description The Description property enables you to provide descriptive information about the field. A description can be up to 255 characters long. Field Size The Field Size property enables you to specify the maximum size of data stored in the field. 1 for the maximum field size values. Format The Format property controls how data appears when displayed. This property enables you to customize how numbers, currency, text, and date-time data appear. Input Mask The Input Mask property provides a mechanism for making data entry easier.
Although the topic of which fields to include in an entity is being deferred until the next chapter, some fields have to be added to the entities early in the process. These fields exist to support the various relationships that exist between the entities. These fields are primary keys and foreign keys. The concepts of primary and foreign keys were introduced in Chapter 1, “An Introduction to Databases,” and were illustrated in Chapter 2. If you need a quick review of these concepts, take a few moments now to do so before continuing.
Click the View button. This toggles to the Design View. 3. Click the View button again; this toggles to the Datalist View. The Datalist View is an alternative way of designing a table. It is not as useful as the Design View. 8 Clicking the View button enables the user to toggle between the Design View and Datalist View of a table. Column details, such as column name, data type, and description, can Lookup tab be viewed in the Design View. Field Properties Caution Note It is important to take great care when viewing the structure of a table.
Absolute beginner's guide to databases by John Petersen