A FOREIGN KEY constraint will not allow a row containing a NULL value in the foreign key column to be added to the table.

Name: A FOREIGN KEY constraint will not allow a row containing a NULL value in the foreign key column to be added to the table.
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Question

A FOREIGN KEY constraint will not allow a row containing a NULL value in the foreign key column to be added to the table.​

Quizplus · Accepted Answer

A FOREIGN KEY constraint allows a row containing a NULL value in the foreign key column, as NULL is considered as the absence of a value and does not violate referential integrity.

A FOREIGN KEY Constraint Will Not Allow a Row Containing