Error 1452 Mysql Query Browser

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Error 1452 Mysql Workbench

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key constraint fails up vote 179 down vote favorite 53 I'm having a bit of a strange problem, I'm trying to add a foreign key to one table that references another, but it is failing for some reason. With my limited knowledge of MySQL, the only thing that could possibly be suspect is that there is a foreign key on a different table referencing the one I am trying to

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reference. Here is a picture of my table relationships, generated via phpMyAdmin: Relationships I've done a SHOW CREATE TABLE query on both tables, sourcecodes_tags is the table with the foreign key, sourcecodes is the referenced table. CREATE TABLE `sourcecodes` ( `id` int(11) unsigned NOT NULL AUTO_INCREMENT, `user_id` int(11) unsigned NOT NULL, `language_id` int(11) unsigned NOT NULL, `category_id` int(11) unsigned NOT NULL, `title` varchar(40) CHARACTER SET utf8 NOT NULL, `description` text CHARACTER SET utf8 NOT NULL, `views` int(11) unsigned NOT NULL, `downloads` int(11) unsigned NOT NULL, `time_posted` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP, PRIMARY KEY (`id`), KEY `user_id` (`user_id`), KEY `language_id` (`language_id`), KEY `category_id` (`category_id`), CONSTRAINT `sourcecodes_ibfk_3` FOREIGN KEY (`language_id`) REFERENCES `languages` (`id`) ON DELETE CASCADE ON UPDATE CASCADE, CONSTRAINT `sourcecodes_ibfk_1` FOREIGN KEY (`user_id`) REFERENCES `users` (`id`) ON DELETE CASCADE ON UPDATE CASCADE, CONSTRAINT `sourcecodes_ibfk_2` FOREIGN KEY (`category_id`) REFERENCES `categories` (`id`) ON DELETE CASCADE ON UPDATE CASCADE ) ENGINE=InnoDB AUTO_INCREMENT=4 DEFAULT CHARSET=latin1 CREATE TABLE `sourcecodes_tags` ( `sourcecode_id` int(11) unsigned NOT NULL, `tag_id` int(11) unsigned NOT NULL, KEY `sourcecode_id` (`sourcecode_id`), KEY `tag_id` (`tag_id`), CONSTRAINT `sourcecodes_tags_ibfk_1` FOREIGN KEY (`tag_id`) REFERENCES `tags` (`id`) ON DELETE CASCADE ON UPDATE CASCADE ) ENGINE=InnoDB DEFAULT CHARSET=latin1 It would be great if anyone could tell me what is going on here, I've had

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Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask mysql query browser tutorial Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign http://stackoverflow.com/questions/1253459/mysql-error-1452-cannot-add-or-update-a-child-row-a-foreign-key-constraint-fa up mysql foreign key error #1452 up vote 3 down vote favorite 1 ALTER TABLE `groups` ADD FOREIGN KEY ( `company_id` ) REFERENCES `summaries`.`companies` ( `id` ) ON DELETE CASCADE ; MySQL said: #1452 - Cannot add or update a child row: a foreign key constraint fails (`summaries/#sql-164a_33c`, CONSTRAINT `#sql-164a_33c_ibfk_1` FOREIGN KEY (`company_id`) REFERENCES `companies` (`id`) ON DELETE CASCADE) companies.id is primary http://stackoverflow.com/questions/5198600/mysql-foreign-key-error-1452 auto increment int(11) company_id is index int(11) I don't understand the error message. Can anyone shed some light on this? mysql share|improve this question asked Mar 4 '11 at 19:58 Webnet 23.3k65200345 Paste outputs of both create table groups and summaries.companies ? –Zimbabao Mar 4 '11 at 20:00 add a comment| 4 Answers 4 active oldest votes up vote 22 down vote accepted That means you have at least one row in the child table that references a non-existent row in the parent table. If you are absolutely sure that you are okay with having a data integrity issue like that, you can add the foreign key by disabling foreign key checks before you run the ALTER TABLE command: SET FOREIGN_KEY_CHECKS = 0; share|improve this answer answered Mar 4 '11 at 20:10 Ike Walker 33.4k95278 add a comment| up vote 2 down vote I just had this problem, although in a somewhat more specific scenario. In my case, I had added, to an existing table, a column that I needed to be both nullable and act as a foreign key (i.e., for non-null entrie

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Datos General » Mysql » Problema Foreign Key Nula Estas en el tema de Problema Foreign Key Nula en el foro de Mysql en Foros del Web. Hola a todos, os explico. Tengo esta tabla: Código HTML: CREATE TABLE `partido` ( `id` int(5) NOT NULL auto_increment, `temporada_id` int(5) NOT NULL, `competicion_id` int(5) ... #1 (permalink) 31/08/2009, 11:15 mogoxd Fecha de Ingreso: diciembre-2007 Mensajes: 77 Antigüedad: 8 años, 9 mesesPuntos: 3 Problema Foreign Key Nula Hola a todos, os explico. Tengo esta tabla: Código HTML: CREATE TABLE `partido` ( `id` int(5) NOT NULL auto_increment, `temporada_id` int(5) NOT NULL, `competicion_id` int(5) NOT NULL, `local_id` int(5) NOT NULL, `visitante_id` int(5) default NULL, `fecha` varchar(10) collate utf8_unicode_ci NOT NULL, PRIMARY KEY (`id`), UNIQUE KEY `local_id` (`local_id`,`visitante_id`,`fecha`), KEY `temporada_id` (`temporada_id`), KEY `competicion_id` (`competicion_id`), KEY `visitante_id` (`visitante_id`), CONSTRAINT `partido_ibfk_1` FOREIGN KEY (`temporada_id`) REFERENCES `temporada` (`id`) ON DELETE CASCADE ON UPDATE CASCADE, CONSTRAINT `partido_ibfk_2` FOREIGN KEY (`competicion_id`) REFERENCES `competicion` (`id`) ON DELETE CASCADE ON UPDATE CASCADE, CONSTRAINT `partido_ibfk_3` FOREIGN KEY (`local_id`) REFERENCES `equipo` (`id`) ON DELETE CASCADE ON UPDATE CASCADE, CONSTRAINT `partido_ibfk_4` FOREIGN KEY (`visitante_id`) REFERENCES `equipo` (`id`) ON DELETE CASCADE ON UPDATE CASCADE ) ENGINE=InnoDB AUTO_INCREMENT=6 DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci Y el problema lo tengo al ejecutar esta consulta: Código HTML: INSERT INTO partido VALUES ( '', '$temporada', '$competicion', '$equipo', '', '$fecha' ) El valor de visitante_id deberia poder ser nulo. Si agrego una linea mediante el INSERT de phpmyadmin no me tira ningun error, pero al hacer insert mediante SQL me lanza el siguiente error: Código HTML: #1452 - Cannot add or update a child row: a foreign key constraint fails (`playascs_playas/partido`, CONSTRAINT `partido_ibfk_4` FOREIGN KEY (`visitante_id`) REFERENCES `equipo` (`id`) ON DELETE CASCADE ON UPDATE CASCADE) He p