<database> A column in a database table containing values that are also
found in some primary key column (of a different table). By extension, any
reference to entities of a different type.
Some RDBMSs allow a column to be explicitly labelled as a foreign key and only
allow values to be inserted if they already exist in the relevant primary key
[Is it still a foregn key if the primary key is in a different column in the
ForceOne « ForceTwo « foreground « foreign key
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