By John Petersen
Absolute Beginner's advisor to Databases brings the weather of a database jointly utilizing effortless to appreciate language, excellent for the real newbie. It not just supplies particular palms on perform, but in addition offers an outline of designing, keeping and utilizing a database. This e-book covers what databases are used for, why databases are very important, why the layout of the database is critical, database normalization, keys to strong database layout, variations in forms of databases, and indexes--what they're, how we use them, and why they're important.
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Additional info for Absolute beginner's guide to databases
The field, CustomerID, is set as the primary key for the entity. There will be other fields, of course. However, the topic of which fields to include in which entities is discussed in Chapter 4. 5 The Customer consists of two attributes: the name of the entity and one primary key field. Let’s take a moment to review some important concepts. 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.
Through the analysis and examination of business forms and documents, you discover the specific pieces of customer information that must be captured. Another example is tracking time. In your current project, the Time Entry and Billing database, you know you will have to keep track of time at some level of detail. A typical timesheet might contain some or all of the following information: ■ Employee name ■ Date of work ■ Start time ■ End time ■ Task performed ■ Project ■ Client In looking at this example involving a timesheet, it becomes clearer as to what information the database must store.
Information supporting how this information will be displayed in a form can be found in the Lookup tab of the Table Designer. 21. 21 The Lookup tab provides the information and user interface components used to support form construction. Lookup tab Field Properties Lookups are easier for users to work with because users can work with descriptions instead of the meaningless numerical key values. Using the SupplierID field as an illustration, the following outlines the information the Lookup tab provides: ■ Display Control—The user-interface element (combo box, list box, or text box) that is used to display the lookup.
Absolute beginner's guide to databases by John Petersen