What is a foreign key constraint in database management?
- A key that identifies the relationship between two tables
- A key that is not related to any other table
- A key that is not unique
- A key that uniquely identifies each record in a database table
A foreign key constraint is used to enforce referential integrity in a relational database. It ensures that a value in a column (or a group of columns) of one table matches a value in another table's primary key or unique key.
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