I've trying to create a foreign key from a table to another, using the tools that MySQL Workbench provides, but all that I get is this error:
ERROR 1452: Cannot add or update a child row: a foreign key constraint fails (`mediacom`.`#sql-758_4`, CONSTRAINT `med_agente_ibfk_1` FOREIGN KEY (`id_agenzia`) REFERENCES `med_agenzia` (`id`) ON DELETE NO ACTION ON UPDATE NO ACTION)
SQL Statement:
ALTER TABLE `mediacom`.`med_agente`
ADD CONSTRAINT `med_agente_ibfk_1`
FOREIGN KEY (`id_agenzia`)
REFERENCES `mediacom`.`med_agenzia` (`id`)
ON DELETE NO ACTION
ON UPDATE NO ACTION
The thing that confuses me the most is the line mediacom
.#sql-758_4
, since the real query that I use is :
ALTER TABLE `mediacom`.`med_agente`
ADD INDEX `med_agente_ibfk_1_idx` (`id_agenzia` ASC) COMMENT '';
ALTER TABLE `mediacom`.`med_agente`
ADD CONSTRAINT `med_agente_ibfk_1`
FOREIGN KEY (`id_agenzia`)
REFERENCES `mediacom`.`med_agenzia` (`id`)
ON DELETE NO ACTION
ON UPDATE NO ACTION;
The index is inserted fine but the rest is ignored, why?
This is the med_agente table
CREATE TABLE `med_agente` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`nome` varchar(225) DEFAULT NULL,
`cognome` varchar(225) DEFAULT NULL,
`disabilitato` tinyint(1) DEFAULT NULL,
`mod_time` datetime DEFAULT NULL,
`mod_user` varchar(255) DEFAULT NULL,
`codmobile` decimal(13,0) DEFAULT NULL,
`codfisso` decimal(13,0) DEFAULT NULL,
`id_agenzia` int(11) DEFAULT NULL,
PRIMARY KEY (`id`),
KEY `med_agente_ibfk_1_idx` (`id_agenzia`)
) ENGINE=InnoDB AUTO_INCREMENT=4 DEFAULT CHARSET=utf8;
And this is med_agenzia
CREATE TABLE `med_agenzia` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`ragSociale` varchar(255) NOT NULL,
`descrizione` varchar(255) DEFAULT NULL,
`indirizzo` varchar(255) DEFAULT NULL,
`citta` varchar(255) DEFAULT NULL,
`CAP` int(11) DEFAULT NULL,
`provincia` varchar(255) DEFAULT NULL,
`tel` int(11) DEFAULT NULL,
`mail` varchar(255) DEFAULT NULL,
`codFiscale` varchar(255) DEFAULT NULL,
`pIVA` varchar(255) DEFAULT NULL,
`id_azsuper` int(11) DEFAULT NULL,
`disabilitato` tinyint(1) DEFAULT NULL,
`mod_time` datetime DEFAULT NULL,
`mod_user` varchar(255) DEFAULT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=4 DEFAULT CHARSET=utf8;
where's the problem???
Before you run your query
Run this :
Then set it to 1
after you run your Alter query.