Sorry, the word is counpound instead of composed. -- João Cândido de Souza Neto
""João Cândido de Souza Neto"" <j...@consultorweb.cnt.br> escreveu na mensagem news:20101013144314.9787.qm...@lists.mysql.com... > I´d never seen before a composed primary key that has an auto_increment > field on it. > > May be I can be wrong but I think it wont work properly. > > As far as I know, if you have an auto_increment field it must be your > single primary key. Am I wrong? > > -- > João Cândido de Souza Neto > > "Tompkins Neil" <neil.tompk...@googlemail.com> escreveu na mensagem > news:aanlkti=-1wvuxdfsq4km6rfz0wsrlpphug1bnt4x9...@mail.gmail.com... >> I've the following table. But why isn't the primary key unique, e.g. >> preventing duplicates if entered ? >> >> CREATE TABLE `players_master` ( >> >> `players_id` bigint(20) NOT NULL AUTO_INCREMENT, >> `default_teams_id` bigint(20) NOT NULL, >> `first_name` varchar(100) COLLATE utf8_unicode_ci NOT NULL, >> `second_name` varchar(100) COLLATE utf8_unicode_ci NOT NULL, >> `known_as` varchar(200) COLLATE utf8_unicode_ci DEFAULT NULL, >> `dob` date NOT NULL, >> `countries_id` char(2) COLLATE utf8_unicode_ci NOT NULL, >> `retirement_date` date DEFAULT NULL, >> `positions_id` varchar(3) COLLATE utf8_unicode_ci NOT NULL, >> `estimated_value` double NOT NULL DEFAULT '0', >> `contract_wage` double NOT NULL DEFAULT '0', >> `rating` int(11) NOT NULL, >> PRIMARY KEY (`players_id`,`default_teams_id`), >> KEY `FK_players_master_countries_id` (`countries_id`), >> KEY `FK_players_master_positions_id` (`positions_id`), >> KEY `IDX_first_name` (`first_name`), >> KEY `IDX_known_as` (`known_as`), >> KEY `IDX_second_name` (`second_name`), >> KEY `IDX_dob` (`dob`), >> KEY `IDX_estimated_value` (`estimated_value`), >> KEY `IDX_contract_wage` (`contract_wage`), >> KEY `IDX_rating` (`rating`), >> KEY `FK_players_master_teams_id` (`default_teams_id`), >> CONSTRAINT `FK_players_master_countries_id` FOREIGN KEY (`countries_id`) >> REFERENCES `countries` (`countries_id`) ON DELETE NO ACTION ON UPDATE NO >> ACTION, >> CONSTRAINT `FK_players_master_positions_id` FOREIGN KEY (`positions_id`) >> REFERENCES `positions` (`positions_id`) ON DELETE NO ACTION ON UPDATE NO >> ACTION, >> CONSTRAINT `FK_players_master_teams_id` FOREIGN KEY (`default_teams_id`) >> REFERENCES `teams_master` (`teams_id`) ON DELETE NO ACTION ON UPDATE NO >> ACTION >> ) ENGINE=InnoDB AUTO_INCREMENT=1001 DEFAULT CHARSET=utf8 >> COLLATE=utf8_unicode_ci >> >> I'm confused, I thought primary keys were always unique ? >> >> Cheers >> Neil >> > > -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/mysql?unsub=arch...@jab.org
