For a schema relationship, both schemas must have what?

For a schema relationship, both schemas must have primary identities defined. This is essential because primary identities act as unique identifiers for records within the schemas, allowing for effective linking and relationships between different data sets. When the primary identities are established, it enables the system to recognize and correlate information accurately between schemas. This is foundational for creating meaningful relationships in data integration and analytics, ensuring that records from one schema can be effectively associated with records from another schema.

In contrast, data permissions, attributes, and sharing policies play important roles in their respective contexts but are not foundational requirements for forming schema relationships. Data permissions govern who can access the data, attributes describe the characteristics of the data, and sharing policies dictate how data can be shared among different users or systems. However, none of these elements are as crucial to establishing the relationship itself as the primary identities are.