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- 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));
- 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);
- SELECT s1.*
- FROM shop s1
- LEFT JOIN shop s2 ON s1.article = s2.article AND s1.price < s2.price
- WHERE s2.price IS NULL;
- +---------+--------+-------+
- | 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 |
- +---------+--------+-------+
- SELECT *
- FROM shop s1
- LEFT JOIN shop s2 ON s1.article = s2.article AND s1.price < s2.price;
- +---------+--------+-------+---------+--------+-------+
- | article | dealer | price | article | dealer | price |
- +---------+--------+-------+---------+--------+-------+
- | 0001 | A | 3.45 | 0001 | B | 3.99 |
- | 0001 | B | 3.99 | NULL | NULL | NULL |
- | 0002 | A | 10.99 | NULL | NULL | NULL |
- | 0003 | B | 1.45 | 0003 | C | 1.69 |
- | 0003 | C | 1.69 | NULL | NULL | NULL |
- | 0003 | D | 1.25 | 0003 | B | 1.45 |
- | 0003 | D | 1.25 | 0003 | C | 1.69 |
- | 0004 | D | 19.95 | NULL | NULL | NULL |
- +---------+--------+-------+---------+--------+-------+
- SELECT *
- FROM shop s1
- LEFT JOIN shop s2 ON s1.article = s2.article;
- +---------+--------+-------+---------+--------+-------+
- | article | dealer | price | article | dealer | price |
- +---------+--------+-------+---------+--------+-------+
- | 0001 | A | 3.45 | 0001 | A | 3.45 |
- | 0001 | A | 3.45 | 0001 | B | 3.99 |
- | 0001 | B | 3.99 | 0001 | A | 3.45 |
- | 0001 | B | 3.99 | 0001 | B | 3.99 |
- | 0002 | A | 10.99 | 0002 | A | 10.99 |
- | 0003 | B | 1.45 | 0003 | B | 1.45 |
- | 0003 | B | 1.45 | 0003 | C | 1.69 |
- | 0003 | B | 1.45 | 0003 | D | 1.25 |
- | 0003 | C | 1.69 | 0003 | B | 1.45 |
- | 0003 | C | 1.69 | 0003 | C | 1.69 |
- | 0003 | C | 1.69 | 0003 | D | 1.25 |
- | 0003 | D | 1.25 | 0003 | B | 1.45 |
- | 0003 | D | 1.25 | 0003 | C | 1.69 |
- | 0003 | D | 1.25 | 0003 | D | 1.25 |
- | 0004 | D | 19.95 | 0004 | D | 19.95 |
- +---------+--------+-------+---------+--------+-------+
- `| 0001 | A | 3.45 | 0001 | A | 3.45 |`
- `| 0001 | B | 3.99 | 0001 | A | 3.45 |`
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