By John Petersen
Absolute Beginner's consultant to Databases brings the weather of a database jointly utilizing effortless to appreciate language, excellent for the real newbie. It not just provides particular palms on perform, but additionally offers an summary of designing, retaining and utilizing a database. This ebook covers what databases are used for, why databases are very important, why the layout of the database is critical, database normalization, keys to sturdy database layout, alterations in forms of databases, and indexes--what they're, how we use them, and why they're vital.
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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. For example, with a telephone number, an input mask of (____) - ____ ____ makes entering the various components of a phone number easier.
A field name can be up to 64 characters long and can contain any combination of letters, numbers, spaces, and special characters. Invalid characters include the period, exclamation point, accent, and brackets. Believe it or not, double quotation marks are valid characters in a field name. It is doubtful whether anybody would find this feature useful. As a rule, you will want to stick with the letters of the alphabet, the numbers 0 through 9, and the underscore character. Although you can have embedded spaces in your field names, they can be more trouble than they are worth.
With a report, you can build a layout that makes the data easier to view and is more useful to the end user. Queries gather data together from one or more tables, and reports provide a useful format for viewing the data. 17 demonstrates how a report brings a query to life. 17 The Products by Category report in Print Preview View. CHAPTER 2 THE ANATOMY OF A REAL DATABASE 37 The structure of a report is a bit more complicated than the structure of tables and queries. 18 shows the Products by Category report in Design View.
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