mysql> use test; Database changed mysql> CREATE TABLE shop ( -> article INT(4) UNSIGNED ZEROFILL DEFAULT '' NOT NULL, -> dealer CHAR() DEFAULT '' NOT NULL, -> price DOUBLE(,2) DEFAULT '0.' NOT NULL, -> PRIMARY KEY(article, dealer)); Query OK, 0 rows affected (0. sec) mysql> INSERT INTO shop VALUES -> (1,'A',3.),(1,'B',3.),(2,'A',.),(3,'B',1.), -> (3,'C',1.),(3,'D',1.),(4,'D',.); Query OK, 7 rows affected (0. sec) Records: 7 Duplicates: 0 Warnings: 0 mysql> select * from shop; +---------+--------+-------+ | article | dealer | price | +---------+--------+-------+ | | A | 3. | | | B | 3. | | | A | . | | | B | 1. | | | C | 1. | | | D | 1. | | | D | . | +---------+--------+-------+ 7 rows in set (0. sec) mysql> select article,max(price) from shop group by article -> ; +---------+------------+ | article | max(price) | +---------+------------+ | | 3. | | | . | | | 1. | | | . | +---------+------------+ 4 rows in set (0. sec) mysql> select article,max(price),dealer from shop group by article; +---------+------------+--------+ | article | max(price) | dealer | +---------+------------+--------+ | | 3. | A | | | . | A | | | 1. | B | | | . | D | +---------+------------+--------+ 4 rows in set (0. 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 | +---------+--------+-------+ | | B | 3. | | | A | . | | | C | 1. | | | D | . | +---------+--------+-------+ 4 rows in set (0. 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 | +---------+--------+-------+ | | B | 3. | | | A | . | | | C | 1. | | | D | . | +---------+--------+-------+ 4 rows in set (0. 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
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