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--- data_concept:foreign_key [2023/02/19 19:28]
peter
+++ data_concept:foreign_key [2024/03/08 13:33]
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-=====Secondary 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]].