Below is an instruction that describes a task, paired with an input that provides further context. Write a response that appropriately completes the request.

### Instruction:

Convert text to sql: What are the names of ships that have more than one captain? | captain : captain_id , name , ship_id , age , class , rank | ship : ship_id , name , type , built_year , class , flag | captain.ship_id = ship.ship_id | 

### Response:

select _ from _ group by _ having count ( _ ) > _ | select ship.name from ship join captain on ship.ship_id = captain.ship_id group by captain.ship_id having count ( * ) > 1