Which document has the most draft copies? List its document id and number of draft copies.
SELECT document_id , count(copy_number) FROM Draft_Copies GROUP BY document_id ORDER BY count(copy_number) DESC LIMIT 1;
SELECT document_id , count(copy_number) FROM Draft_Copies GROUP BY document_id ORDER BY count(copy_number) DESC LIMIT 1;
[{'document_id': 2, 'count(copy_number)': 2}]