THIS IS OUTDATED. All documentation is now on the github wiki. Please refer there or to the 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.
| 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_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. |
| relationship_id | Yes | varchar(20) | A unique identifier to the type or nature of the Relationship as defined in the RELATIONSHIP 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| valid_end_date | Yes | date | The date when the Concept Relationship became invalid because it was deleted or superseded (updated) by a new relationship.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. |