Sorry Joao, I thought that was pretty standard to have a primary key with auto_increment ??
2010/10/13 João Cândido de Souza Neto <j...@consultorweb.cnt.br> > 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=neil.tompk...@googlemail.com > >
