On 10/13/2010 10:37 AM, Tompkins Neil wrote:
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
I see no reason why this won't work. Show us some duplicate data and I
may be able to explain how to fix your definition.
--
Shawn Green
MySQL Principal Technical Support Engineer
Oracle USA, Inc.
Office: Blountville, TN
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