A client has a database of customers who purchase different products.

In a scenario where customers can purchase multiple products, and each product can be purchased by multiple customers, a many-to-many data model is the most appropriate approach in Adobe Campaign Classic. This model involves creating a linking table (or schema) that references both the customer schema and the product schema.

By using a many-to-many relationship, the developer can efficiently track and manage customer-product associations without data redundancy. This structure enables accurate navigation and querying across customer purchases, providing flexibility to track purchases, manage customer preferences, and analyze purchasing behaviors across the entire customer base.