MySQL 查找价格最高的图书经销商的几种SQL语句

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mysql> use test;  Database changed  mysql> CREATE TABLE shop (  -> article INT(4) UNSIGNED ZEROFILL DEFAULT '0000' NOT NULL,  -> dealer CHAR(20) DEFAULT '' NOT NULL,  -> price DOUBLE(16,2) DEFAULT '0.00' NOT NULL,  -> PRIMARY KEY(article, dealer));  Query OK, 0 rows affected (0.13 sec)  mysql> INSERT INTO shop VALUES  -> (1,'A',3.45),(1,'B',3.99),(2,'A',10.99),(3,'B',1.45),  -> (3,'C',1.69),(3,'D',1.25),(4,'D',19.95);  Query OK, 7 rows affected (0.03 sec)  Records: 7 Duplicates: 0 Warnings: 0  mysql> select * from shop;  +---------+--------+-------+  | article | dealer | price |  +---------+--------+-------+  | 0001 | A | 3.45 |  | 0001 | B | 3.99 |  | 0002 | A | 10.99 |  | 0003 | B | 1.45 |  | 0003 | C | 1.69 |  | 0003 | D | 1.25 |  | 0004 | D | 19.95 |  +---------+--------+-------+  7 rows in set (0.06 sec)  mysql> select article,max(price) from shop group by article  -> ;  +---------+------------+  | article | max(price) |  +---------+------------+  | 0001 | 3.99 |  | 0002 | 10.99 |  | 0003 | 1.69 |  | 0004 | 19.95 |  +---------+------------+  4 rows in set (0.05 sec)  mysql> select article,max(price),dealer from shop group by article;  +---------+------------+--------+  | article | max(price) | dealer |  +---------+------------+--------+  | 0001 | 3.99 | A |  | 0002 | 10.99 | A |  | 0003 | 1.69 | B |  | 0004 | 19.95 | D |  +---------+------------+--------+  4 rows in set (0.00 sec)  mysql> select article,dealer,price from shop s1  -> where price=(select max(s2.price) from shop s2  -> where s1.article=s2.article);  +---------+--------+-------+  | article | dealer | price |  +---------+--------+-------+  | 0001 | B | 3.99 |  | 0002 | A | 10.99 |  | 0003 | C | 1.69 |  | 0004 | D | 19.95 |  +---------+--------+-------+  4 rows in set (0.01 sec)  mysql> select s1.article,dealer,s1.price  -> from shop s1  -> join(  -> select article,max(price) as price from shop  -> group by article) as s2  -> on s1.article = s2.article and s1.price = s2.price;  +---------+--------+-------+  | article | dealer | price |  +---------+--------+-------+  | 0001 | B | 3.99 |  | 0002 | A | 10.99 |  | 0003 | C | 1.69 |  | 0004 | D | 19.95 |  +---------+--------+-------+  4 rows in set (0.05 sec)  mysql> select s1.article,s1.dealer,s1.price from shop s1  -> left join shop s2 on s1.article=s2.article and s1.price select s1.article,s1.dealer,s1.price,s2.* from shop s1 left join shop s2  on s1.article=s2.article and s1.price