Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE bridge ( architect_id number, id number, name text, location text, length_meters number, length_feet number )
TABLE: CREATE TABLE architect ( id text, name text, nationality text, gender text )
TABLE: CREATE TABLE mill ( architect_id number, id number, location text, name text, type text, built_year number, notes text )

### Question ###
What is the most common mill type, and how many are there?

### Accurate SQL ###

SELECT type, COUNT(*) FROM mill GROUP BY type ORDER BY COUNT(*) DESC LIMIT 1