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Inspecting the Sample Database
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The Northwind Traders sample database introduced in 1 is an order-processing application If it weren t for the use of the Access relational-database management features, the process could be both cumbersome and time-consuming The following sections examine the sample database in more detail
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As mentioned earlier, a relational database consists of several tables, each of which contains data focused on an aspect of the database After distributing the data among the tables, the tables are related to one another by means of identifying the matching fields The Northwind data is distributed among 20 tables, as shown in the Navigation Pane in Figure 2-3 The principal tables are Products, Orders, and Customers The other tables support the order processing by providing additional data, such as the name of the employee who took the order, the category of the product, product suppliers, order status, and shipping methods Each of these tables is a good example of grouping data items used for the same purpose The Orders table contains all the order information, such as the order number; customer identifier; employee identifier; order date, date required, and date shipped; shipping method; and the complete name and address of destination Additional fields track the payment and
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Northwind Traders data distributed among many tables
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T h e Wo r l d o f R e l a t i o n a l D a t a b a s e s
tax information Three other tables are related to the Orders table: Order Details, Orders Status, and Order Details Status The Customers table contains the customer identifier, as well as the customer s complete address and telephone numbers It also includes a new attachment field type and a hyperlink to a web page If this information wasn t included in a separate table, it would be repeated in every order placed by the customer The Products table contains the current state of the inventory of each product The fields include the product identifier, name, supplier identifier, category, quantity per unit, unit price, units in stock and on order, the reorder level, and a field that indicates whether or not the product has been discontinued The table also includes a new attachment field Inventory tracking is accomplished with three tables: Inventory Transactions, Inventory Restocking, and Inventory Restocking Details Purchase orders are also tracked in the Northwind database with three tables: Purchase Orders, Purchase Order Details, and Purchase Order Status Other tables contain peripheral information for the purpose of reducing data redundancy The Employees table contains the employee identifier, birth date and hire date, name and address, telephone numbers, the name of the employee s supervisor, and a memo field for notes The Suppliers table includes the supplier identifier, name and address, and a point of contact The Shippers table contains the company name and telephone numbers, as well as the shipper identifier The Invoices table lists the order and shipping dates as well as the costs billed to the customer
PART I PART I PART I
Viewing Table Relationships
Most of the tables in the Northwind database are related in some way To see the relationship scheme, choose the Database Tools tab in the ribbon and click the Relationships command in the Show/Hide command group The Relationships window (Figure 2-4) shows eight tables with their relationship lines
NOTE To simplify the view, many of the peripheral tables were hidden in this view of the
Relationships window When you choose Relationships, you may see all the tables in a tangled arrangement Each of these eight tables is related to at least one other table, thereby creating a relational database Take a look at a few of the most important relationships: The Orders table is the centerpiece of this display and is related to several tables: Customers, Shippers, Order Details, Invoices, and Employees The Orders and Invoices are linked by the Order ID field Customers and Shippers are linked to the Orders table by their ID fields The Employees table is linked to the Orders table by the Employee ID field The Products table is related to two tables: Order Details and Suppliers, all using the Product ID field
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