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<h1 class="title toc-ignore">Example_Queries</h1>
<h4 class="author">Clair Blacketer</h4>
<h4 class="date">September 29, 2020</h4>
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<p>The query below will find all standard concepts in the Visit domain
that do not have any ancestors. These are considered “top-level” visit
concepts and can be used to define categories of visits in cohort
definitions. For example, the Inpatient Visit concept <a
href="https://athena.ohdsi.org/search-terms/terms/9201">9201</a>
subsumes the concepts for Inpatient Hospital and Inpatient in
Psychiatric Facility. Instead of creating a concept set with all of
these terms to define an inpatient visit you can use 9201 and all of
its descendants, a concept found using the top-level query.</p>
<p>WITH top_level AS (SELECT concept_id, concept_name FROM concept LEFT
JOIN concept_ancestor ON concept_id=descendant_concept_id AND
ancestor_concept_id!=descendant_concept_id WHERE domain_id=Visit AND
standard_concept=S AND ancestor_concept_id IS NULL ) SELECT
top_level.concept_id, top_level.concept_name, descendant.concept_id,
descendant.concept_name FROM concept_ancestor JOIN top_level ON
top_level.concept_id = ancestor_concept_id JOIN concept descendant ON
descendant.concept_id = descendant_concept_id WHERE descendant.domain_id
= Visit;</p>
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