orderByRaw() Eloquent in laravel

You need to write an eloquent query and order the result by the difference of two columns.

orderBy query:

Stud::where('created_at', '>', '2020-03-08)
      ->orderBy('updated_at', 'desc')
      ->get();

the difference between updated_at and created_at?

Stud::where('created_at', '>', '2020-03-08')
      ->orderByRaw('(updated_at - created_at) desc')
      ->get();

orderByRaw()

orderByRaw() method will apply order by clause without changing anything in it.

select * from table 
where created_at > '2020-03-08' 
order by (updated_at - created_at) desc