Hello, OHDSI members! There is a question: test for standard concept explicitly excludes concept_ID zero. On the other hand concept_ID=0 is valid for any column holding a concept id and therefore concept_id = 0 shold be classified as standard. So I see here ambiguity. @Christian_Reich wonders about the way to fix this
How do you query standard concepts?
Check for concept_id !=0?
Check for standard_concept=‘S’
other choice (Atlas, Hades, etc.)