documentation:cdm:concept_relationship
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documentation:cdm:concept_relationship [2014/12/02 01:50] jduke |
documentation:cdm:concept_relationship [2017/09/25 14:58] (current) clairblacketer |
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| ===== CONCEPT_RELATIONSHIP table ===== | ===== CONCEPT_RELATIONSHIP table ===== | ||
| + | **THIS IS OUTDATED. All documentation is now on the [[https://github.com/OHDSI/CommonDataModel/wiki|github wiki]]. Please refer there or to the [[projects:workgroups:cdm-wg|CDM working group]] for more information** | ||
| - | The CONCEPT_RELATIONSHIP table contains records that define direct relationships between any two Concepts and the nature or type of the relationship. Each type of a relationship is defined in the RELATIONSHIP table, whcih can generally be classified as hierarchical (parent-child) or non-hierarchical (lateral). All Relationships are directional, and each Concept Relationship is represented twice symmetrically within the CONCEPT_RELATIONSHIP table. For example, the two SNOMED concepts of ‘Acute myocardial infarction of the anterior wall’ and ‘Acute myocardial infarction’ have two Concept Relationships: 1- ‘Acute myocardial infarction of the anterior wall’ ‘Is a’ ‘Acute myocardial infarction’, and 2- ‘Acute myocardial infarction’ ‘Subsumes’ ‘Acute myocardial infarction of the anterior wall’. | + | The CONCEPT_RELATIONSHIP table contains records that define direct relationships between any two Concepts and the nature or type of the relationship. Each type of a relationship is defined in the [[documentation:cdm:relationship|RELATIONSHIP]] table. |
| ^Field^Required^Type^Description^ | ^Field^Required^Type^Description^ | ||
| - | |concept_id_1|Yes|integer|A foreign key to a Concept in the CONCEPT table associated with the relationship. Relationships are directional, and this field represents the source concept designation.| | + | |concept_id_1|Yes|integer|A foreign key to a Concept in the [[documentation:cdm:concept|CONCEPT]] table associated with the relationship. Relationships are directional, and this field represents the source concept designation.| |
| - | |concept_id_2|Yes|integer|A foreign key to a Concept in the CONCEPT table associated with the relationship. Relationships are directional, and this field represents the destination concept designation.| | + | |concept_id_2|Yes|integer|A foreign key to a Concept in the [[documentation:cdm:concept|CONCEPT]] table associated with the relationship. Relationships are directional, and this field represents the destination concept designation.| |
| - | |relationship_id|Yes|varchar(20)|A unique identifier to the type or nature of the Relationship as defined in the RELATIONSHIP table.| | + | |relationship_id|Yes|varchar(20)|A unique identifier to the type or nature of the Relationship as defined in the [[documentation:cdm:relationship|RELATIONSHIP]] table.| |
| |valid_start_date|Yes|date|The date when the instance of the Concept Relationship is first recorded.| | |valid_start_date|Yes|date|The date when the instance of the Concept Relationship is first recorded.| | ||
| |valid_end_date|Yes|date|The date when the Concept Relationship became invalid because it was deleted or superseded (updated) by a new relationship. Default value is 31-Dec-2099.| | |valid_end_date|Yes|date|The date when the Concept Relationship became invalid because it was deleted or superseded (updated) by a new relationship. Default value is 31-Dec-2099.| | ||
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| ==== Conventions ==== | ==== Conventions ==== | ||
| + | * Relationships can generally be classified as hierarchical (parent-child) or non-hierarchical (lateral). | ||
| + | * All Relationships are directional, and each Concept Relationship is represented twice symmetrically within the [[documentation:cdm:concept_relationship|CONCEPT_RELATIONSHIP]] table. For example, the two SNOMED concepts of ‘Acute myocardial infarction of the anterior wall’ and ‘Acute myocardial infarction’ have two Concept Relationships: 1- ‘Acute myocardial infarction of the anterior wall’ ‘Is a’ ‘Acute myocardial infarction’, and 2- ‘Acute myocardial infarction’ ‘Subsumes’ ‘Acute myocardial infarction of the anterior wall’. | ||
| * There is one record for each Concept Relationship connecting the same Concepts with the same relationship_id. | * There is one record for each Concept Relationship connecting the same Concepts with the same relationship_id. | ||
| * Since all Concept Relationships exist with their mirror image (concept_id_1 and concept_id_2 swapped, and the relationship_id replaced by the reverse_relationship_id from the [[documentation:cdm:relationship|RELATIONSHIP]] table), it is not necessary to query for the existence of a relationship both in the concept_id_1 and concept_id_2 fields. | * Since all Concept Relationships exist with their mirror image (concept_id_1 and concept_id_2 swapped, and the relationship_id replaced by the reverse_relationship_id from the [[documentation:cdm:relationship|RELATIONSHIP]] table), it is not necessary to query for the existence of a relationship both in the concept_id_1 and concept_id_2 fields. | ||
| - | * Concept Relationships define direct relationships between Concepts. Indirect relationships through 3rd concepts are not captured in this table. However, the [[documentation:cdm:cdm:concept_ancestor|CONCEPT_ANCESTOR]] table does this for hierachical relationships over several "generations" of direct relationships. | + | * Concept Relationships define direct relationships between Concepts. Indirect relationships through 3rd Concepts are not captured in this table. However, the [[documentation:cdm:cdm:concept_ancestor|CONCEPT_ANCESTOR]] table does this for hierachical relationships over several "generations" of direct relationships. |
| * In previous versions of the CDM, the relationship_id used to be a numerical identifier. See the [[documentation:cdm:relationship|RELATIONSHIP]] table. | * In previous versions of the CDM, the relationship_id used to be a numerical identifier. See the [[documentation:cdm:relationship|RELATIONSHIP]] table. | ||
documentation/cdm/concept_relationship.1417485033.txt.gz · Last modified: 2014/12/02 01:50 by jduke
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