Most relational databases aren't relational enough For example in Drupal you can have a node table which is a foreign key relationship to many other custom tab

Most relational databases aren't relational enough For example in Drupal you can have a node table which is a foreign key relationship to many other custom tables In SQL I can't say get me all the nodes that have a start date without explicitly left joining to a potentially dynamic number of other tables using a higher level language to modify the query In Datomic or Datascript or Datahike or Datalevin or Crux this query would be trivial these are not nosql databases they're EAVT datalog engines, that in some cases also support SQL for compatibility