[Reference: Salesforce Primary Key Documentation,  Challenges with Missing Primary Keys:, Some data sources may lack a natural primary key, making it difficult to uniquely identify records., Reference: Salesforce Data Integration Guide,  Solution: Creating a Composite Key:, Composite Key Definition: A composite key is created by combining two or more fields to generate a unique identifier., Formula Fields: Using a formula field, different fields can be concatenated to create a unique composite key., Example: If "Email" and "Phone Number" together uniquely identify a record, a formula field can concatenate these values to form a composite key., Reference: Salesforce Composite Key Creation Guide,  Steps to Create a Composite Key:, Identify fields that, when combined, can uniquely identify each record., Create a formula field that concatenates these fields., Use this composite key as the primary key for the data source in Data Cloud., Reference: Salesforce Formula Field Documentation, , ]