MySQL ORDER BY的使用

语法：SELECT 列名 FROM 表名 ORDER BY 列名 ASC | DESC;

mysql> SELECT * FROM student_info;
+------+---------+
| age  | name    |
+------+---------+
|   12 | Lili    |
|   27 | Jack    |
|   25 | Rose    |
|   25 | Ann     |
|   26 | Mark    |
|   68 | Bill    |
|   16 | James   |
|   20 | Fred    |
|    8 | Gary    |
|   22 | Martin  |
|   35 | Charles |
|   31 | Joseph  |
|   49 | Henry   |
|   57 | Mike    |
| NULL | Bob     |
+------+---------+
15 rows in set (0.01 sec)

mysql>

（1）用ACS表示按正序排序（即：从小到大排序）

mysql> SELECT * FROM student_info ORDER BY age ASC;
+------+---------+
| age  | name    |
+------+---------+
| NULL | Bob     |
|    8 | Gary    |
|   12 | Lili    |
|   16 | James   |
|   20 | Fred    |
|   22 | Martin  |
|   25 | Rose    |
|   25 | Ann     |
|   26 | Mark    |
|   27 | Jack    |
|   31 | Joseph  |
|   35 | Charles |
|   49 | Henry   |
|   57 | Mike    |
|   68 | Bill    |
+------+---------+
15 rows in set (0.00 sec)

mysql>

（2）用DESC表示按倒序排序（即：从大到小排序）

mysql> SELECT * FROM student_info ORDER BY age DESC;
+------+---------+
| age  | name    |
+------+---------+
|   68 | Bill    |
|   57 | Mike    |
|   49 | Henry   |
|   35 | Charles |
|   31 | Joseph  |
|   27 | Jack    |
|   26 | Mark    |
|   25 | Ann     |
|   25 | Rose    |
|   22 | Martin  |
|   20 | Fred    |
|   16 | James   |
|   12 | Lili    |
|    8 | Gary    |
| NULL | Bob     |
+------+---------+
15 rows in set (0.00 sec)

mysql>