สอบถามเรื่องการเขียนคิวรี่ แยกเป็นกลุ่มในคำสั่ง sql

 h  |  n   |   d   |   m  |   f   |  total   |
11 | 01  |  ab  |    2  |   3  |    5      |
12 | 02  |  ab  |    1  |   2  |    3      |
13 |  01 |  ed  |    2  |   2  |    4      |
11 |  02 |  id   |    2  |   2  |     4     |
11 |  03 |  ad  |    1  |  0   |     1     |

+---------------+----------------------------------------------+-------------+------------+
| Continent     | Name                                         | SurfaceArea | Population |
+---------------+----------------------------------------------+-------------+------------+
| Asia          | China                                        |  9572900.00 | 1277558000 |
| Asia          | India                                        |  3287263.00 | 1013662000 |
| Asia          | Kazakstan                                    |  2724900.00 |   16223000 |
| Asia          | Saudi Arabia                                 |  2149690.00 |   21607000 |
| Asia          | Indonesia                                    |  1904569.00 |  212107000 |
| Europe        | Russian Federation                           | 17075400.00 |  146934000 |
| Europe        | Ukraine                                      |   603700.00 |   50456000 |
| Europe        | France                                       |   551500.00 |   59225700 |
| Europe        | Spain                                        |   505992.00 |   39441700 |
| Europe        | Sweden                                       |   449964.00 |    8861400 |