Aggregates and Summary Rows
To round out our discussion of advanced DataGrid controls, let’s examine complex reports in which you have summary rows with partial totals. The sample application extracts from the Northwind database information about the customers and orders. The grid displays all the orders issued in a given year, sorted by customer. Each row contains the total price of the order, which is already an aggregate value because the order is stored as a collection of items. As shown in Figure 6-10, the summary row is inserted between customers and contains the total number of orders and the total price of all orders.
Figure 6-10. A more complex DataGrid control showing partial totals and summary rows.
The Right Way to Query
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