In Chapter 3, Building Data Models, we looked at creating physical relationships between tables as part of our look at data modeling. For example, in our data model, we have a physical relationship defined between the Product and Sales tables, as shown in Figure 6-1:
A physical relationship in a data model requires that at least one side of the relationship is linked to a column in a table that contains unique values. In the preceding example, we've built the relationship using the ProductKey column of the Product table linked to the ProductKey column of the Sales table, creating a one-to-many relationship.
With this relationship, any filters applied to columns of the Product table are propagated using a filter on the Sales table. The list of values filtered in the ProductKey...
