$data = DB::table('test')
->join('users as u', 'u.id', 'test.testId')
->leftJoin...$data = DB::table('test')
->join('users as u', 'u.id', 'test.testId')
->leftJoin...$data = DB::table('test')
->join('users as u', 'u.id', 'test.testId')
->leftJoin...'u.id', 'u.title', 'u.email')
->join('users as u', 'u.id', 'test.testId')
->leftJoin