# SELECT Publisher, COUNT(*) AS 'Number' FROM books GROUP BY Publisher ORDER BY Number DESC;
+-----------+--------+
| Publisher | Number |
+-----------+--------+
| Rheinwerk |     10 |
| O'Reilly  |      6 |
| Wiley     |      5 |
| Hanser    |      5 |
| Mitp      |      4 |
| C.H. Beck |      2 |
| Tintal    |      1 |
| Franzis   |      1 |
| Dpunkt    |      1 |
| Apress    |      1 |
+-----------+--------+