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Can a foreign key contain a null value?

A foreign key containing null values cannot match the values of a parent key, since a parent key by definition can have no null values. However, a null foreign key value is always valid, regardless of the value of any of its non-null parts.

Can foreign keys be null and repetitive?

It is possible to have more than one foreign key in a table, and they can accept a null value. Foreign key values do not need to be unique; duplicate values can be stored in foreign key columns. Foreign keys do have to link back to columns with unique values. Those columns are frequently primary keys.

Can primary key be a foreign key?

It is perfectly fine to use a foreign key as the primary key if the table is connected by a one-to-one relationship, not a one-to-many relationship.

Can a foreign key be null value True or false?

A FOREIGN KEY constraint can contain null values; however, if any column of a composite FOREIGN KEY constraint contains null values, verification of all values that make up the FOREIGN KEY constraint is skipped.

Can you make a non primary key a foreign key?

A foreign key can refer to either a unique or a primary key of the parent table. If the foreign key refers to a non-primary unique key, you must specify the column names of the key explicitly.

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