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: Who are Bob's friends? | person : name , age , city , gender , job | personfriend : name , friend , year | personfriend.friend = person.name | personfriend.name = person.name | 

### Response:

select _ from _ where _ | select personfriend.friend from person join personfriend on person.name = personfriend.name where person.name = 'Bob'