Hello!
I am seeing different info on this column. The (Redshift) DDL suggests Vocabulary.vocabulary_version can be null;
https://github.com/OHDSI/CommonDataModel/blob/master/Redshift/OMOP%20CDM%20ddl%20-%20Redshift.sql
But the documentation says Vocabulary.vocabulary_version’ is required’:
Shall we use DDL as the source of truth?