Differences

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--- data_concept:primary_key [2023/06/10 19:43]
peter
+++ data_concept:primary_key [2024/03/08 13:33] (current)
@@ Line 2: / Line 2: @@
 ===Definition===
-A primary key is a [[data_concept:data element|data element]] that uniquely identifies a [[data_concept:data record|data record]].
+A primary key is one or more [[data_concept:data element|data element]] that uniquely identifies a [[data_concept:data record|data record]].
 ===Relation===
-Primary key is subtype of [[data_concept:data element|data element]].
+|Primary key| is child of |[[data_concept:data element|data element]]|
+|Primary key|identifies|[[data_concept:data record|data record]]|
+|Primary key|can be used as link to another [[data_concept/data_record|data record]] by a|[[data_concept/foreign_key|foreign key]]|
+{{tag>All}}
-===Note===
-A primary key can also consists of two or more [[data_concept:data element|data elements]].