whereColumn()

Query

                    Student::whereColumn('created_at','>','updated_at')
                    

output

                    select * from student where created_at > updated_at
                    

                         $snapFaces=SnapFaces::join('snap','snap_faces.snap_id','snap.snap_id')
                            ->where(function ($query) {
                                $query->whereColumn('snap.last_upload','>','snap_faces.last_compare')
                                ->orWhereNull('snap_faces.last_compare');
                            })
                            ->whereNotNull('snap.last_upload')->get();