=====Foreign key=====

===Definition===
A foreign key is a [[data_concept:data element|data element]] of a [[data_concept:data file |data file]] that corresponds to a [[data_concept:primary key|primary key]] of another [[data_concept:data file|data file]].

===Relations===
|Foreign key|is child of |[[data_concept:data element|data element]]|
|Foreign key|corresponds with|[[data_concept:primary key|primary key]]|of another [[data_concept:data file|data file]]|

{{tag>All}}