Re: Primary key not unique on InnoDB table

[João Cândido de Souza Neto]

Sorry, the word is counpound instead of composed.

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mensagem news:20101013144314.9787.qmail@ style="color:#666">stripped...
> 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?
>
> -- 
>
> "Tompkins Neil" <neil.tompkins@stripped> escreveu na mensagem 
> news:AANLkTi=-1wVUxDFsQ4KM6RfZ0wsRLpPHuG1bnt4X9RhK@ style="color:#666">stripped...
>> 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
>>
>
>