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 ship ( name VARCHAR, CLASS VARCHAR, ship_id VARCHAR )
TABLE: CREATE TABLE captain ( name VARCHAR, CLASS VARCHAR, ship_id VARCHAR )

### Question ###
what are the names and classes of the ships that do not have any captain yet?

### Accurate SQL ###

SELECT name, CLASS FROM ship WHERE NOT ship_id IN (SELECT ship_id FROM captain)