You cannot have an invalid entry in the foreign key column; at the same time, you cannot delete a vendor row as long as a product row references that vendor. this is known as: referential integrity.
This is the term that is used to refer to the dependency on a primary key. This is the type of dependency that occurs based on the fact that the foreign key is much more dependent on the primary key.
This terminology is known to be associated with the relationship that is in existent within the given tables. Each of the tables that are of interest have a primary key. These appear based on the given relationships with the other keys in the table.
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