Download Absolute Beginner s Guide to Databases by John Petersen PDF

By John Petersen

Absolute Beginner's advisor to Databases brings the weather of a database jointly utilizing effortless to appreciate language, ideal for the real newbie. It not just offers particular arms on perform, but additionally offers an outline of designing, preserving 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 necessary, database normalization, keys to good database layout, transformations in different types of databases, and indexes--what they're, how we use them, and why they're vital.

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Row Source Type—A lookup can pull its data from a query, static values, or fields from another table. In this case, the SupplierID and companyname fields are queried from the supplier table as the source of the lookup. ■ Row Source—The actual query, static list, or field list used to populate the lookup. ■ Bound Column—The column value that is written to the field. In this case, the SupplierID value from the Supplier table is written to the SupplierID field of the Products table. The SupplierID field is the first field in the query; hence, the bound column for the lookup is set to 1.

In this case, you should choose to open an existing file by clicking that option and then clicking OK. mdb database file. The default file extension for an Access database file is MDB. 3). 3 The main database dialog box provides access to all database components, including tables, queries, forms, and reports. Note Access also provides the ability to write Web pages, macros, and module code. Although you will see references to these items in various illustrations, they are beyond the scope of this book.

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.

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