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 all directors who made one movie? | movie : mid , title , year , director | reviewer : rid , name | rating : rid , mid , stars , ratingdate | rating.rid = reviewer.rid | rating.mid = movie.mid | 

### Response:

select _ from _ group by _ having count ( _ ) = _ | select director from movie group by director having count ( * ) = 1