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What is the function of the foreign key when referring to tables in a relational database?...

What is the function of the foreign key when referring to tables in a relational database?

Question options:

To encrypt data using a symmetrical key

To provide a unique identifier for each row of a table

To decrypt data using an asymmetrical key

To lookup values in a parent table to ensure referential integrity

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Answer #1

The table containing the foreign key is called the child table, and the table containing the candidate key is called the referenced or parent table.

A foreign key is a column or group of columns in a relational database table that provides a link between data in two tables. It acts as a cross-reference between tables because it references the primary key of another table, thereby establishing a link between them

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