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MS Access Lab 3
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Relationships in MS Access are links between attributes, but relationships in the ER diagram . can be converted into an MS. Access table as shown in Fig .
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Why Define Relationships? After you've set up different tables for each subject in your Microsoft Access Database, you need a way of telling Microsoft Access how to bring that information back together again. The first step in this process is to define relationships between your tables. After you've done that, you can create queries, forms, and reports to display information from several tables at once. For example, this form includes information from five tables:
How do relationships work? In the previous example, the fields in five tables must be coordinated so that they show information about the same order. This coordination is accomplished with relationships between tables. A relationship works by matching data in key fields — usually a field with the same name in both tables. In most cases, these matching fields are the primary key from one table, which provides a unique identifier for each record, and a foreign key in the other table. For example, employees can be associated with orders they're responsible for by creating a relationship between the “Employees” table and the “Orders” table using the EmployeeID fields (which we will show later).
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