Laravel 5子查询雄辩或查询生成器

Question

谁能告诉我Laravel 5等效查询（雄辩或查询生成器），用于下面的查询 -

select * from questions where id NOT in (select question_id from answers where student_id=5) AND exam_id=4 

Answer 1

由我自己解决，

这完美的工作了我

$ questions = DB :: select（“select * from questions where id not in（select question_id from answers where student_id = 5）AND exam_id = 4”）;