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Figure 4-7 The New Column window
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There will be one constraint in the Customer table You want to ensure that no two customers have the same CustomerID column value To do that, you can make this column a primary key for the table Primary keys are used to uniquely identify each record in the table Each table can have only one primary key assigned to it A column (or column combination) used for the primary key is guaranteed to be unique The PostgreSQL system will not allow users to enter records with a duplicate primary key On the Constraints tab, ensure that the Primary Key value is set in the drop-down box, and click the Add button The New Primary Key window appears On the Properties tab, set the name of the primary key (call it CustomerKey) and define which tablespace it should be located in You do not have to place a primary key in the same tablespace as the data table (and, in fact, many database administrators do not for performance purposes) The primary key object creates an index of the database that is accessed during queries to help speed things up PostgreSQL can quickly search the index looking for the key value without having to read all of the table columns After filling out the information on the Properties tab, click the Columns tab On this tab, you must select the columns that are used for the primary key For this exercise, select
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Column Name ProductID ProductName Model Manufacturer UnitPrice Inventory
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Data Type char six characters varchar varchar varchar money int4
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Description Unique primary key identifier that is not NULL Name of the product Product model number Name of the manufacturer Current price of product Number of units in inventory
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Table 4-4 The Product Table Columns
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the CustomerID column You can choose to make a constraint deferrable, which means PostgreSQL does not check the constraint at the end of each command, but rather at the end of a transaction When you have defined the primary key, click the Add button After filling out the forms, click OK to add the constraint to the Table Properties window When you have all of the columns and the constraint configured, click the SQL tab to view the generated SQL statements required to implement your selections In this case, you can see how pgAdmin III saves you from lots of typing by not having to manually enter the SQL code to create the table columns After reviewing the SQL statements, click OK to create the columns and constraint Back in the pgAdmin III window, you should see the new columns and constraint added to the table objects Now you can create the other two tables for the application The Product table columns are shown in Table 4-4 Create the Product table using the same procedures used to create the Customer table Do not forget to add the primary key constraint to the table for the ProductID column The last table is the Order table This one is a little different from the other two tables It uses column values derived from the other two tables Table 4-5 describes the Order table Create the Order table as you did the other two tables Create the CustomerID and ProductID columns using the same data type and length as with the associated columns in the other tables The difference with the Order table is in the constraints There are two additional constraints that must be created You must create constraints to ensure that the CustomerID and ProductID values entered into the Order table are valid Click the Constraints tab in the New Table window for the Order table First, create the primary key on the OrderID column as normal After creating that, from the dropdown menu on the Constraints tab, select Foreign Key and click Add The New Foreign Key window appears, shown in Figure 4-8 For the first constraint, we will match the CustomerID column to the CustomerID column in the Customer table, so call the new constraint Customer In the References textbox, click the drop-down arrow and select the store Customer table (remember,
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