PostgreSQL 8 for Windows in Visual Studio .NET

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PostgreSQL 8 for Windows
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Column Name OrderID CustomerID ProductID PurchaseDate Quantity TotalCost
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Data Type char six characters char six characters char six characters date int4 money
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Description Unique primary key identifier that is not NULL The CustomerID from the Customer table (not NULL) The ProductID from the Product table (not NULL) Date of purchase The number of items purchased The total cost of the purchase
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Table 4-5 The Columns for the Order Table
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Figure 4-8 New Foreign Key window for the Order table
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tables are referenced by schemanametablename) Next, click the Columns tab The Local Column textbox references the column in the Order table you want to match Select the CustomerID column The Referencing textbox references the column in the Customer table you want to constrain the column to Select the CustomerID column, click Add, then click OK Do the same with the ProductID column (except reference the ProductID column in the Products table) The Action tab allows you to specify an action to take on the related data when an event occurs on the table If the foreign key column value is updated or deleted from the table, the related value in the foreign key table can also be updated or deleted For now we will not worry about that, so leave the settings at the default No Action When you are finished, click OK to create the table
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Now you have a running database system with three configured tables The next step is to put data in your tables Our friend pgAdmin III can help us do that as well Right-click the table object you want to enter data into and choose the View Data menu item The pgAdmin III Edit Data window appears, shown in Figure 4-9
Figure 4-9 The pgAdmin III Edit Data window
PostgreSQL 8 for Windows
Figure 4-10 Error message for violating column constraint
The table columns are shown as columns across the top of the Edit Data window Within the window are grids showing the individual records within the table You can enter data directly into the next available row in the window When you have entered data for all of the columns in a record, press enter to submit the data All constraints applied to the columns apply to the Edit Data window If you violate any of the constraints, an error message appears when you try to submit the data, as shown in Figure 4-10 In Figure 4-10, I attempted to enter a record with the same CustomerID column value as an existing record The Edit Data window produced an error message informing me of my error Unfortunately, when you get an error message, all of the data entered into the record is lost, and you must start over on that record By default, the Edit Data window displays all of the records contained in the table and sorts them in ascending order based on the defined primary key You can use the Sort/Filter option button (the funnel icon) to change this Clicking this button produces
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Managing PostgreSQL on Windows
the View Data Options window (a slight misnaming of windows and icons), which has two tabs: Data Sorting Allows you to specify how to sort data as it is displayed in the Edit Data window Filter Allows you to specify what data to view using simple expressions You can use standard comparison expressions within the Filter tab to filter the data you are looking for After entering your expressions, click the Validate button to see if your filter expressions will work One warning about using column names in the Filter tab (actually, this applies to all of PostgreSQL) If you use the filter expression LastName = 'Blum' you will get an error when you click the Validate button, as shown in Figure 4-11 All the error message says is that the column lastname is invalid This error throws many novice administrators off, as they assume that indeed they do have a column named lastname What has happened is that PostgreSQL assumes all column names are
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