----- Original Message -----
From: "Tobias K. Tobiasen" <tobiasen@stripped>
To: <mysql@stripped>
Sent: Thursday, April 04, 2002 6:46 PM
Subject: Group by?
> Hello
>
> I think the gruop by is behaving strange. Could someone please explain
> this or maybe point me to a definition of the group by. (Inspired by
> http://www.mysql.org/doc/E/x/Examples.html).
>
>
> 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);
>
> 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 (0.00 sec)
>
> mysql> select * from shop GROUP BY article;
> +---------+--------+-------+
> | article | dealer | price |
> +---------+--------+-------+
> | 0001 | A | 3.45 |
> | 0002 | A | 10.99 |
> | 0003 | B | 1.45 |
> | 0004 | D | 19.95 |
> +---------+--------+-------+
> 4 rows in set (0.00 sec)
>
> QUESTION: I had expected 7 rows - where did the rest go?
Try SELECT * FROM shop GROUP BY article,dealer;
(same thing for the rest of queries)
Regards,
Jocelyn Fournier
Presence-PC
