Hi @Mario_D!

While primary & foreign key constraints are generally available in Databricks Runtime 15.2 and above, they are strictly informational only.

This means that a primary key will not prevent duplicates from being added to a table and a foreign key does not require the referenced value to exist in another table.

https://docs.databricks.com/en/tables/constraints.html#declare-primary-key-and-foreign-key-relations...