You include logical data objects that relate to each other in a data object model. For example, the logical data objects Customer and Account appear in a logical data object model for a national bank. The logical data object model describes the relationship between customers and accounts.

In the model, the logical data object Account includes the attribute Account_Number. Account_Number is a primary key, because it uniquely identifies an account. Account has a relationship with the logical data object Customer, because the Customer data object needs to reference the account for each customer.

You can drag a physical data object into the logical data object model editor to create a logical data object. Or, you can create a logical data object and define the attributes and keys.