Create a Relationship Between Two Tables
If the tables in your data source do not have existing relationships, or if you add new tables, you can use the tools in PowerPivot for Excel to create new relationships. For information about how relationships are used in PowerPivot for Excel, see Understanding Relationships.
In Windows Vista and Windows 7, features in the PowerPivot window are available on a ribbon, which is discussed in this topic. In Windows XP, features are available from a set of menus. If you are using Windows XP and want to see how the menu commands relate to the ribbon commands, see The PowerPivot UI in Windows XP.
To create a relationship between two tables
Considerations for Creating Relationships
When creating a relationship, consider the following:
There can be only one relationship between each pair of tables.
The data values in Related Lookup Column must be unique. In other words, the column cannot contain duplicates.
Each table must have a single column that uniquely identifies each row in that table.
The data types in Column and Related Lookup Column must be compatible. For more information about data types, see Data Types Supported in PowerPivot Workbooks.
For a complete list of requirements, see "Requirements for Relationships" in Understanding Relationships.