Visual Basic

Access 2002 Programming by Example by Bob Villareal

By Bob Villareal

The booklet covers basics equivalent to database normalization, question layout, item manipulation and optimization, and customized programming for varieties and reviews. The reader becomes extra effective, efficient, and a professional in entry VBA. This publication offers with getting info from outdoor assets and utilizing VBA to make sure info integrity and consistency, which no different entry VBA booklet does. It additionally tackles difficulties in a number of day by day events that programmers usually face.

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If you have an Employees table and want to include a picture of each employee, this is the data type to use. Hyperlink This is an alphanumeric field that is used as a hyperlink address to connect you to the Internet. However, you are not limited to just URLs (Universal Resource Locators). You can connect to an e-mail address, a Microsoft Office document, a table, query, form, report, or data access page.

This is called transient dependency. It’s not surprising that you have duplicate values because two or more clients could be from the same state. The State Code field could function on its own in a lookup table without the Client data. Another way to look at this is that the State field is dependent on a nonkey field (State Code). If a company moves and the State Code changes, the State also changes. This does not conform to the third normal form. In the second normal form you eliminated partial dependencies; in the third normal form, you eliminate transient dependencies.

To illustrate, two 60-row tables set up this way in a query produce 3,600 row results. This is because 60 times 60 equals 3,600. Without a join or a where clause in a query containing two or more tables, you can easily get confused with the results. In short, joins usually are the easiest, most efficient method of comparing and linking tables. If you let Access normalize your tables, it creates joins for you in the Relationships window. Because it is in your best interest to get familiar with this window, take the following guided tour of what it offers.

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