从两个表中获取唯一结果或如何通过ID在laravel中减少两个表

Question

I have Two Tables Fee and Bill_Fee . Bill_Fee has been made to resolve the many to many relationship between Fee and Bill.

Fee
----------
id    
amt  
student_id

Bill_Fee
----------
fee_id   
bill_id

First the Fee table should be selected with the help of student_id and then i need to MINUS as a set(A={1,2,4,6,8} B={1,2,6,8,9,0}) A-B={4} Like this so that if the fee_id exists in bill fee the details of those fees should not be extracted. and Those fee_id which are not in Bill should be extracted

Answer 1

you can use sub query & NOT EXISTS like this

SELECT *
FROM Fee AS a
WHERE NOT EXISTS (
  SELECT *
  FROM Bill_Fee AS b 
  WHERE a.id=b.fee_id
)

there is multiple way to execute query in laravel

you can execute query like this

$sqlQuery = "SELECT ____________";
$result = DB::select(DB::raw($sqlQuery));