To make sure that related records are matched appropriately in your view results, the wizard specifies a join between the tables in your view. The join is based on relationships established within your database.
If a relationship does not currently exist and the wizard could not suggest fields for a join, you need to choose the fields. Typically, tables include fields for this purpose and usually have the same name.
To specify a join, select the desired fields from the two drop-down list boxes and then choose Add. You must specify a join between the tables before moving on to the next step.