28 lines
1.3 KiB
Plaintext
28 lines
1.3 KiB
Plaintext
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---
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title: "Example_Queries"
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author: "Clair Blacketer"
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date: "September 29, 2020"
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output: html_document
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---
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```{r setup, include=FALSE}
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knitr::opts_chunk$set(echo = TRUE)
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```
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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 [9201](https://athena.ohdsi.org/search-terms/terms/9201) 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 it's descendants, a concept found using the top-level query.
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WITH top_level
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AS
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(SELECT concept_id, concept_name
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FROM concept
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LEFT JOIN concept_ancestor ON concept_id=descendant_concept_id
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AND ancestor_concept_id!=descendant_concept_id
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WHERE domain_id='Visit' AND standard_concept='S'
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AND ancestor_concept_id IS NULL
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)
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SELECT top_level.concept_id, top_level.concept_name, descendant.concept_id, descendant.concept_name
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FROM concept_ancestor
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JOIN top_level ON top_level.concept_id = ancestor_concept_id
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JOIN concept descendant ON descendant.concept_id = descendant_concept_id
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WHERE descendant.domain_id = 'Visit';
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