Which key is specifically used to enforce referential integrity between two tables?Group of answer choicesComposite KeyForeign KeySuper KeyPrimary Key

1. Break Down the Problem

The question asks which key is specifically used to enforce referential integrity between two tables in a database context. We have four options to evaluate: Composite Key, Foreign Key, Super Key, and Primary Key.

2. Relevant Concepts

• Referential Integrity: This is a property of a relational database which ensures that relationships between tables remain consistent. A foreign key in one table points to a primary key in another table, maintaining this integrity.

3. Analysis and Detail

1. Composite Key: This is a key that consists of two or more columns used to uniquely identify a record in a table. It does not specifically enforce referential integrity.

2. Foreign Key: This is a column (or a group of columns) in one table that uniquely identifies a row of another table. It is specifically used to enforce referential integrity between tables, as it establishes a link between the foreign key in one table and the primary key in another.

3. Super Key: A super key is a set of one or more columns that can uniquely identify a record in a table. While it indicates uniqueness, it does not pertain directly to relational integrity.

4. Primary Key: This is a specific type of unique key used to identify a record in a table. It ensures that no duplicate records exist but does not enforce referential integrity across tables.

4. Verify and Summarize

Upon reviewing the definitions and functions of each key, it is clear that the Foreign Key is the decision factor for enforcing referential integrity between two tables.

Final Answer

The key specifically used to enforce referential integrity between two tables is the Foreign Key.