mysql 获取数学成绩最高以及最低的同学

mysql> select * from test;
+----+----------+-------+-----------+
| id | name     | score | subject   |
+----+----------+-------+-----------+
|   | xiaoming |     | shuxue    |
|   | xiaohong |     | shuxue    |
|   | xiaohong |     | english   |
|   | xiaohong |     | physics   |
|   | xiaohong |     | astronaut |
|   | xiaoming |     | physics   |
|   | xiaoming |     | astronaut |
|   | xiaoming |     | english   |
|   | xiaobai  |     | astronaut |
|  | xiaobai  |     | english   |
|  | xiaobai  |     | physics   |
|  | xiaobai  |     | shuxue    |
|  | xiaohei  |     | astronaut |
|  | xiaohei  |     | shuxue    |
|  | xiaohei  |     | physics   |
|  | xiaohei  |     | english   |
+----+----------+-------+-----------+
 rows in set (0.00 sec)

成绩最高

mysql> select name,score from test where subject='shuxue' order by score desc limit ;
+----------+-------+
| name     | score |
+----------+-------+
| xiaoming |     |
+----------+-------+
 row in set (0.00 sec)

成绩最低

mysql> select name,score from test where subject='shuxue' order by score limit ;
+---------+-------+
| name    | score |
+---------+-------+
| xiaohei |     |
+---------+-------+
 row in set (0.00 sec)