Mysql Foreign Key Error
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Mysql Cannot Add Foreign Key Constraint
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Mysql Error 1215
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Mysql Foreign Key Syntax
or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a http://dev.mysql.com/doc/en/innodb-foreign-key-constraints.html community of 6.2 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up MySQL Foreign Key Error 1005 errno 150 up vote 31 down vote favorite 8 I'm doing a small DataBase with MySQL Workbench. I have a main table, called "Immobili", which has a Primary Key http://stackoverflow.com/questions/4063141/mysql-foreign-key-error-1005-errno-150 composed by four columns: (Comune, Via, Civico, Immobile). Now, I also have three other tables, wich have the same primary key (Comune, Via, Civico, Immobile), but these fields are also referenced to the table Immobili. First question: Can I make a Primary Key that is also a Foreign Key? Second Question: When I try to export the changes it says: Executing SQL script in server # ERROR: Error 1005: Can't create table 'dbimmobili.condoni' (errno: 150) CREATE TABLE IF NOT EXISTS `dbimmobili`.`Condoni` ( `ComuneImmobile` VARCHAR(50) NOT NULL , `ViaImmobile` VARCHAR(50) NOT NULL , `CivicoImmobile` VARCHAR(5) NOT NULL , `InternoImmobile` VARCHAR(3) NOT NULL , `ProtocolloNumero` VARCHAR(15) NULL , `DataRichiestaSanatoria` DATE NULL , `DataSanatoria` DATE NULL , `SullePartiEsclusive` TINYINT(1) NULL , `SullePartiComuni` TINYINT(1) NULL , `OblazioneInEuro` DOUBLE NULL , `TecnicoOblazione` VARCHAR(45) NULL , `TelefonoTecnico` VARCHAR(15) NULL , INDEX `ComuneImmobile` (`ComuneImmobile` ASC) , INDEX `ViaImmobile` (`ViaImmobile` ASC) , INDEX `CivicoImmobile` (`CivicoImmobile` ASC) , INDEX `InternoImmobile` (`InternoImmobile` ASC) , PRIMARY KEY (`ComuneImmobile`, `Vi
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more http://stackoverflow.com/questions/1457305/mysql-creating-tables-with-foreign-keys-giving-errno-150 about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack http://stackoverflow.com/questions/5198600/mysql-foreign-key-error-1452 Overflow is a community of 6.2 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up MySQL Creating tables with Foreign Keys giving errno: 150 up vote 78 foreign key down vote favorite 38 I am trying to create a table in MySQL with two foreign keys, which reference the primary keys in 2 other tables, but I am getting an errno: 150 error and it will not create the table. Here is the SQL for all 3 tables: CREATE TABLE role_groups ( `role_group_id` int(11) NOT NULL `AUTO_INCREMENT`, `name` varchar(20), `description` varchar(200), PRIMARY KEY (`role_group_id`) ) ENGINE=InnoDB; CREATE TABLE mysql foreign key IF NOT EXISTS `roles` ( `role_id` int(11) NOT NULL AUTO_INCREMENT, `name` varchar(50), `description` varchar(200), PRIMARY KEY (`role_id`) ) ENGINE=InnoDB; create table role_map ( `role_map_id` int not null `auto_increment`, `role_id` int not null, `role_group_id` int not null, primary key(`role_map_id`), foreign key(`role_id`) references roles(`role_id`), foreign key(`role_group_id`) references role_groups(`role_group_id`) ) engine=InnoDB; Any help would be greatly appreciated. mysql foreign-keys errno share|improve this question edited Sep 21 '09 at 23:37 Bill Karwin 283k50395569 asked Sep 21 '09 at 22:55 user176842 1 Could you post the error output and tell us which command (of the three) is causing the error? –dave Sep 21 '09 at 23:08 4 What's with the back-ticks around auto_increment? That's not valid. Auto_increment is a keyword, not an identifier. –Bill Karwin Sep 21 '09 at 23:39 add a comment| 17 Answers 17 active oldest votes up vote 194 down vote I had the same problem with ALTER TABLE ADD FOREIGN KEY. After an hour, I found that these conditions must be satisfied to not get error 150: The two tables must have the same engine i.e. ENGINE=InnoDB. (can be others: ENGINE=MyISAM works too) The two tables must have the same charset. The PK column(s) in the parent table and the FK column(s) must
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 6.2 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign 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 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 23.5k65202345 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 23 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 33.6k95278 add a comment| up vote 2 down vote I j