=====Primary key=====

===Definition===
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 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}}