Management

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By Philip J. Pratt, Joseph J. Adamski

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17 Heaney Seamus 18 Camus Albert 19 Collins, Jr. Bradley 20 Steinbeck John 21 Castelman Riva 22 Owen Barbara 23 O’Rourke Randy 24 Kidder Tracy 25 Schleining Lon FIGURE 1-16 Sample author data for Henry Books Figure 1-17 shows sample book data for Henry Books. Each book has a code that uniquely identifies the book. For each book, Ray also tracks the title, publisher, type of book, and price, and whether the book is a paperback. 00 No FIGURE 1-17 Sample book data for Henry Books Introduction to Database Management 18 Q&A Question: To check your understanding of the relationship between publishers and books, answer the following questions: Who published Jazz?

A relationship is an association between entities. ● A one-to-many relationship between two entities exists when each occurrence of the first entity is related to many occurrences of the second entity and each occurrence of the second entity is related to only one occurrence of the first entity. ● A database is a structure that can store information about multiple types of entities, the attributes of the entities, and the relationships among the entities. ● Premiere Products is an organization whose requirements include information about the following entities: reps, customers, parts, orders, and order lines.

In grouping by RepNum, for example, the customers of sales rep 20 would form one group, the customers of sales rep 35 would form a second group, and the customers of sales rep 65 would form a third group. The calculations are then made for each group. To group records in Access, select the Group By operator in the Total row for the field on which to group. EXAMPLE 10 What is the average balance for all customers of each sales rep? In this example, include the RepNum and Balance fields in the design grid.

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