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--- data_concept:foreign_key [2023/02/19 19:31]
peter ↷ Page name changed from data_concept:secondary_key to data_concept:foreign_key
+++ data_concept:foreign_key [2024/03/08 13:33] (current)
@@ Line 1: / Line 1: @@
-=====Secondary key=====
+=====Foreign key=====
 ===Definition===
-A secondary 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]].
+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}}