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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.
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.
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.

People also ask

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.
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.
A foreign key column in a table points to a column with unique values in another table (often the primary key column) to create a way of cross-referencing the two tables. If a column is assigned a foreign key, each row of that column must contain a value that exists in the foreign column it references.
A primary key is unique and only one contains for a table. There are many unique keys that can contain in a table. In SQL Server, the primary key is not Nullable. But, a unique key may contain only one null value.
A table can have many foreign keys. A foreign key is nullable if any part is nullable. A foreign key value is null if any part is null.

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