db row query in laravel code example

Example 1: laravel wher in

$users = DB::table('users')
                    ->whereIn('id', [1, 2, 3])
                    ->get();

Example 2: DB::table('users')->get();

DB::select('SELECT * FROM users WHERE name = ?', array(Input::get('name')));

Example 3: laravel having

$users = DB::table('users')
                ->groupBy('account_id')
                ->having('account_id', '>', 100)
                ->get();