Grouping Operators
The grouping concept is something that you already know if you ever worked with data. Given a products collection, dividing products into categories would provide a better organization of information. For example, consider the following Category class:
Class Category Property CategoryID As Integer Property CategoryName As StringEnd Class
Now consider the following review of the Product class, with a new CategoryID property:
Class Product Property ProductID As Integer Property ProductName As String Property UnitPrice As Decimal Property UnitsInStock As Integer Property Discontinued As Boolean Property CategoryID As IntegerEnd Class
At this point ...
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