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foreign key definition
<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 column.
[Is it still a foregn key if the primary key is in a different
column in the _same_ table?]
(2005-01-14)
Nearby terms:
ForceOne « ForceTwo « foreground « foreign key » Foresight » for free » fork
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