From 32aebd75531fbd7f530f385f5d574bdd80c0785a Mon Sep 17 00:00:00 2001 From: clairblacketer Date: Wed, 14 Jun 2017 20:32:07 -0400 Subject: [PATCH] Update CONCEPT_RELATIONSHIP --- .../CONCEPT_RELATIONSHIP.md | 21 ++++++++++++++++++- 1 file changed, 20 insertions(+), 1 deletion(-) diff --git a/Documentation/StandardizedVocabularies/CONCEPT_RELATIONSHIP.md b/Documentation/StandardizedVocabularies/CONCEPT_RELATIONSHIP.md index d94902a..0c9068a 100644 --- a/Documentation/StandardizedVocabularies/CONCEPT_RELATIONSHIP.md +++ b/Documentation/StandardizedVocabularies/CONCEPT_RELATIONSHIP.md @@ -7,4 +7,23 @@ --- -# 3.5 CONCEPT_RELATIONSHIP \ No newline at end of file +# 3.5 CONCEPT_RELATIONSHIP + +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](RELATIONSHIP.md) table. + +Field|Required|Type|Description +:-----|:-----|:----|:----- +|concept_id_1|Yes|integer|A foreign key to a Concept in the [CONCEPT](CONCEPT.md) 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](CONCEPT.md) 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](RELATIONSHIP.md) table.| +|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recorded.| +|valid_end_date|Yes|date|The date when the Concept Relationship became invalid because it was deleted or superseded (updated) by a new relationship.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.| +|invalid_reason|No|varchar(1)|Reason the relationship was invalidated. Possible values are 'D' (deleted), 'U' (replaced with an update) or NULL when valid_end_date has the default value.| + +## 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 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. + * 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 [RELATIONSHIP](RELATIONSHIP.md) 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 [CONCEPT_ANCESTOR](CONCEPT_ANCESTOR.md) 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 [RELATIONSHIP](RELATIONSHIP.md) table.