For handling multiple values for a subscriber attribute effectively:
Use Data Extensions: Data Extensions provide a flexible and scalable storage model that can accommodate complex data types, including multiple values for a single attribute per subscriber.
Advantages: Unlike Profile Attributes, which limit each subscriber to a single value per attribute, Data Extensions allow the creation of relational data models that can store multiple entries for individual attributes.
[Reference: Salesforce Marketing Cloud Data Extensions, , , , ]
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