title: What is the equivalent of a collection and a document of firebase in sql?
body: <p>My question is that what is the equivalent of a collection and a document of firebase in other databases like SQL or MongoDB,</p>
  
  <p>I know that there is a table in SQL but what is the equivalent of the following path:</p>
  
  <p>/collection/document/collection</p>
  
  <p>I mean that can I add a table(collection)  to a document in SQL or mongoose and what is the architecture of that?</p>
  
  <p>Thanks,</p>