Let’s imagine a simple situation – you need to write an Eloquent query and order the result by the difference of two columns. Or some other calculation. Time to apply a raw query!
User::where('created_at', '>', '2016-01-01') ->orderBy('updated_at', 'desc') ->get();
Now, what if we need to order by the difference between updated_at and created_at? It looks like this:
User::where('created_at', '>', '2016-01-01') ->orderByRaw('(updated_at - created_at) desc') ->get();
This orderByRaw() method, which is not mentioned in official Laravel documentation, will apply order by clause without changing anything in it, so final query will be:
select * from users where created_at > '2016-01-01' order by (updated_at - created_at) desc
Hope that helps!