mysql> select * from en;
+------+---------------------+
| id   | name                |
+------+---------------------+
|    1 | A                   |
|    2 | B                   |
|    3 | C                   |
|    4 | 2010-01-07 19:42:55 |
+------+---------------------+
4 rows in set (0.03 sec)只要显示一条数据,并且随机调用一条。语句要怎么写?