how many documents are there?
select count ( * ) from draft_copies
What's the least amount of draft copies that a document has?
select count ( copy_number ) from draft_copies group by document_id order by count ( copy_number ) limit 1
What's the most amount of draft copies that a document has?
select count ( copy_number ) from draft_copies group by document_id order by count ( copy_number ) desc limit 1
what's the id of the document that has the most draft copies?
select document_id from draft_copies group by document_id order by count ( copy_number ) desc limit 1
how many draft copies does that document have?
select document_id, count ( copy_number ) from draft_copies group by document_id order by count ( copy_number ) desc limit 1