mysql 获取数学成绩最高以及最低的同学

mysql> select * from test;
+----+----------+-------+-----------+
| id | name     | score | subject   |
+----+----------+-------+-----------+
|  1 | xiaoming |    89 | shuxue    |
|  2 | xiaohong |    89 | shuxue    |
|  3 | xiaohong |    80 | english   |
|  4 | xiaohong |    80 | physics   |
|  5 | xiaohong |    80 | astronaut |
|  6 | xiaoming |    80 | physics   |
|  7 | xiaoming |    80 | astronaut |
|  8 | xiaoming |    80 | english   |
|  9 | xiaobai  |    80 | astronaut |
| 10 | xiaobai  |    80 | english   |
| 11 | xiaobai  |    80 | physics   |
| 12 | xiaobai  |    80 | shuxue    |
| 13 | xiaohei  |    80 | astronaut |
| 14 | xiaohei  |    80 | shuxue    |
| 15 | xiaohei  |    80 | physics   |
| 16 | xiaohei  |    80 | english   |
+----+----------+-------+-----------+
16 rows in set (0.00 sec)

 成绩最高

mysql> select name,score from test where subject='shuxue' order by score desc limit 1;
+----------+-------+
| name     | score |
+----------+-------+
| xiaoming |    89 |
+----------+-------+
1 row in set (0.00 sec)

 成绩最低

mysql> select name,score from test where subject='shuxue' order by score limit 1;
+---------+-------+
| name    | score |
+---------+-------+
| xiaohei |    80 |
+---------+-------+
1 row in set (0.00 sec)