7.11 Performing Aggregate Calculations

The Compute( ) method computes the result of an aggregate query on the rows in the table that meet the filter criteria. Here's an example that illustrates this:

DataTable dt = new Table();
dt.Columns.Add("OrderId", typeof(System.Int32));
dt.Columns.Add("OrderAmount", typeof(System.Decimal));

// ... add some rows

// computes the sum of order amounts for all orders with Id less than 10
Decimal totalOrderAmount = dt.Compute("SUM(OrderAmount)", "OrderId<10")