CREATE TABLE Draft_Copies (document_id VARCHAR, copy_number VARCHAR)

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 NULLS LAST LIMIT 1