排序方式（ASC，DESC）
ORDER BY为我们提供了一种方法，可以通过SELECT部分中的一个或多个项来对结果集进行排序。这是一个按FullName降序排列学生的SQL。默认排序顺序是升序（ASC），但要按相反顺序（降序）排序，请使用DESC。
SELECT studentID, FullName, sat_score
FROM student
ORDER BY FullName DESC;
+-----------+------------------------+-----------+
| studentID | FullName | sat_score |
+-----------+------------------------+-----------+
| 2 | Teri Gutierrez | 800 |
| 3 | Spencer Pautier | 1000 |
| 6 | Sophie Freeman | 1200 |
| 9 | Raymond F. Boyce | 2400 |
| 1 | Monique Davis | 400 |
| 4 | Louis Ramsey | 1200 |
| 7 | Edgar Frank "Ted" Codd | 2400 |
| 8 | Donald D. Chamberlin | 2400 |
| 5 | Alvin Greene | 1200 |
+-----------+------------------------+-----------+
9 rows in set (0.00 sec)
这是与上述相比较的UN-ORDERED，当前，完整学生列表。
SELECT studentID, FullName, sat_score, rcd_updated FROM student;
+-----------+------------------------+-----------+---------------------+
| studentID | FullName | sat_score | rcd_updated |
+-----------+------------------------+-----------+---------------------+
| 1 | Monique Davis | 400 | 2017-08-16 15:34:50 |
| 2 | Teri Gutierrez | 800 | 2017-08-16 15:34:50 |
| 3 | Spencer Pautier | 1000 | 2017-08-16 15:34:50 |
| 4 | Louis Ramsey | 1200 | 2017-08-16 15:34:50 |
| 5 | Alvin Greene | 1200 | 2017-08-16 15:34:50 |
| 6 | Sophie Freeman | 1200 | 2017-08-16 15:34:50 |
| 7 | Edgar Frank "Ted" Codd | 2400 | 2017-08-16 15:35:33 |
| 8 | Donald D. Chamberlin | 2400 | 2017-08-16 15:35:33 |
| 9 | Raymond F. Boyce | 2400 | 2017-08-16 15:35:33 |
+-----------+------------------------+-----------+---------------------+
9 rows in set (0.00 sec)
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