Maybe you really wanted ORDER BY. Tobias K. Tobiasen wrote:
> 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? > > > mysql> select * from shop GROUP BY article having price=max(price); > +---------+--------+-------+ > | article | dealer | price | > +---------+--------+-------+ > | 0002 | A | 10.99 | > | 0004 | D | 19.95 | > +---------+--------+-------+ > 2 rows in set (0.00 sec) > > QUESTION: I had expected 4 rows (one for each article) - where did the > rest go? > > > mysql> select * from shop GROUP BY article having price=min(price); > +---------+--------+-------+ > | article | dealer | price | > +---------+--------+-------+ > | 0001 | A | 3.45 | > | 0002 | A | 10.99 | > | 0004 | D | 19.95 | > +---------+--------+-------+ > 3 rows in set (0.00 sec) > > QUESTION: It seems like group by only return the first row in the > group - is this correct? > > I am not trying to solve a specifik problem - I would just like to > know how the group by works in MySQL. > > T2K > > > > --------------------------------------------------------------------- > Before posting, please check: > http://www.mysql.com/manual.php (the manual) > http://lists.mysql.com/ (the list archive) > > To request this thread, e-mail <[EMAIL PROTECTED]> > To unsubscribe, e-mail > <[EMAIL PROTECTED]> > Trouble unsubscribing? Try: http://lists.mysql.com/php/unsubscribe.php > > --------------------------------------------------------------------- Before posting, please check: http://www.mysql.com/manual.php (the manual) http://lists.mysql.com/ (the list archive) To request this thread, e-mail <[EMAIL PROTECTED]> To unsubscribe, e-mail <[EMAIL PROTECTED]> Trouble unsubscribing? Try: http://lists.mysql.com/php/unsubscribe.php
