计算最大价格。。。

准备的表与数据：

mysql> desc shop ;

+---------+-------------+------+-----+---------+-------+

| Field | Type | Null | Key | Default | Extra |

+---------+-------------+------+-----+---------+-------+

| article | varchar(20) | YES | | NULL | |

| dealer | char(1) | YES | | NULL | |

| price | double | YES | | NULL | |

+---------+-------------+------+-----+---------+-------+

mysql> select * from shop;

+---------+--------+-------+

| article | dealer | price |

+---------+--------+-------+

| 0001 | D | 20.5 |

| 0002 | C | 11.5 |

| 0003 | F | 81.5 |

+---------+--------+-------+

方式1：

mysql> select s1.* from shop s1 left join shop s2 on s1.price <s2.price where s2.article is null;

+---------+--------+-------+

| article | dealer | price |

+---------+--------+-------+

| 0003 | F | 81.5 |

+---------+--------+-------+

方式2：

mysql> select * from shop s1 where price = (select max(price) from shop s2);

+---------+--------+-------+

| article | dealer | price |

+---------+--------+-------+

| 0003 | F | 81.5 |

+---------+--------+-------+

方式3：

mysql> select * from shop order by price desc limit 1;

+---------+--------+-------+

| article | dealer | price |

+---------+--------+-------+

| 0003 | F | 81.5 |

+---------+--------+-------+