ho to select last 30 day data with join table user and employees table in laravel 5.0

recent_employees =DB::table('users.created_at') ->join('employees', 'users.id', '=', 'employees.user_id')

        ->select('users.id', 'name','created_at')
        ->where DATE_SUB(CURDATE(),INTERVAL 30 DAY) <= 'created_at';
        ->get();

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