Discussion
Referential Integrity constraints functions using the __________ concept.
Answer: C
Referential integrity works through the Foreign key.
A referential integrity constraint says a value in one table must match a value in the table it refers to, for example every order's customer_id must exist in the customers table. The referring column is a foreign key, which references the primary key of the other table.
The primary key ensures each row of its own table is unique, a super key is any set of attributes that identifies rows, and a secondary key is an alternative search key. None of them links tables the way a foreign key does.
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