Page 52 - AIS access_chang_ingraham

50 CHAPTER 3 USING ACCESS TO IMPLEMENT A RElATIONAL DATABASE

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FIGURE 3-17

Address City
jPruski, Tom 3200 Santa Teresa Hartford
_ Yocam, William 13778 North Torrey Ave. ISugar Land
Hart, John 2105 East ~in~reet -I0enver _

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FIGURE 3-18

Telephone Number to Phone #. You need to make the adjustment in the Design View
Enter customer information as shown in the datasheet view (Figure 3-18).
9. When you are finished adjusting the form's design and entering the data, close the
form.

10. Using the same approach, create the Artist Form.

Creating Relationships to Link Tables

As stated previously, Access is a relational database. This implies that associations or rela-
tionships are created between attributes (columns) in two tables to link the data from one
table to another. This is important because the relations allow the data to be brought
together in forms and for reporting purposes. Thus, as a result of the relations we build into
the database, we can very easily and quickly query the database to discover what customer
purchased a particular piece of artwork. The REA model of Cherokee's expenditure cycle
is reproduced in Figure 3-19 for review.
Since each artists' pieces can be purchased in any number of purchase events, there
should be a one-to-many relationship established between the Artist Table and the
Purchase Table so that data regarding artists does not have to be duplicated on the