Foreign Key Error 150
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each other. Join them; it only takes a minute: Sign up MySQL Creating tables with Foreign Keys giving errno: 150 up vote 78 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 error 1005 mysql 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 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 282k50394569 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 vo
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Mysql Can't Create Table Errno 150 Foreign Key
the workings and policies of this site About Us Learn more about mssql create table foreign key Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow error 1005 (hy000) can't create table (errno 150) Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each http://stackoverflow.com/questions/1457305/mysql-creating-tables-with-foreign-keys-giving-errno-150 other. Join them; it only takes a minute: Sign up Adding Foreign Key Fails in MySQL (errno 150) up vote 5 down vote favorite I've read many other posts about receiving MySQL errno 150 when trying to add a foreign key copnstraint, however I haven't found a solution yet. I hope I'm not doing something stupid. I made a http://stackoverflow.com/questions/16866318/adding-foreign-key-fails-in-mysql-errno-150 simple test case. Both tables are InnoDB. Both tables are UTF-8. Both columns are int(11) unsigned (making color_id NOT NULL doesn't make a difference). (EDIT: I WAS WRONG ABOUT THIS, AND THIS WAS THE SOLUTION) Here are my two tables: Table widgets: CREATE TABLE `widgets` ( `id` int(11) unsigned NOT NULL AUTO_INCREMENT, `name` varchar(100) NOT NULL DEFAULT '', `color_id` int(11) DEFAULT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8; Table colors: CREATE TABLE `colors` ( `id` int(11) unsigned NOT NULL AUTO_INCREMENT, `name` varchar(10) NOT NULL DEFAULT '', PRIMARY KEY (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8; I just created these tables, there is no content. When I try to add a foreign key constraint to link widgets.color_id to colors.id, this happens: mysql> ALTER TABLE `widgets` ADD FOREIGN KEY (`color_id`) REFERENCES `color` (`id`); ERROR 1005 (HY000): Can't create table 'production.#sql-7b1_2dd7' (errno: 150) I'll just add that I haven't been able to use my GUI tool of choice -- Sequel Pro on OSX -- either. I get the same error message when trying to create a fo
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 http://stackoverflow.com/questions/4061293/mysql-cant-create-table-errno-150 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 4.7 million programmers, just like http://dba.stackexchange.com/questions/61280/altering-table-foreign-keys-produces-an-error-errno150-mysql you, helping each other. Join them; it only takes a minute: Sign up MySQL: Can't create table (errno: 150) up vote 121 down vote favorite 18 I am trying to import a .sql file and its failing foreign key on creating tables. Here's the query that fails: CREATE TABLE `data` ( `id` int(10) unsigned NOT NULL, `name` varchar(100) NOT NULL, `value` varchar(15) NOT NULL, UNIQUE KEY `id` (`id`,`name`), CONSTRAINT `data_ibfk_1` FOREIGN KEY (`id`) REFERENCES `keywords` (`id`) ON DELETE CASCADE ON UPDATE CASCADE ) ENGINE=InnoDB DEFAULT CHARSET=latin1; I exported the .sql from the the same database, I dropped all the tables and now im trying to import it, why is it failing? MySQL: Can't create can't create table table './dbname/data.frm' (errno: 150) sql mysql phpmyadmin mysql-error-1005 share|improve this question edited Oct 31 '10 at 0:37 OMG Ponies 199k37356416 asked Oct 31 '10 at 0:24 gtilx 75421018 1 For essentially all the causes of this error, here is an exhaustive resource for what causes errno 150 (and errno 121/other foreign key errors) in MySQL. –John Smith Sep 29 '12 at 0:47 16 I've found that the columns must be identical (even the unsigned flag must match). –Justin Skiles Dec 19 '12 at 19:54 3 @JohnSmith ... where? –Charles Wood Jul 29 '13 at 17:07 3 I suggest reading this blog post that lists 10 possible causes: verysimple.com/2006/10/22/… –Mark Amery Jan 2 '14 at 13:54 1 @trejder Curses! –Charles Wood Nov 7 '14 at 17:16 | show 2 more comments 27 Answers 27 active oldest votes up vote 134 down vote accepted From the MySQL - FOREIGN KEY Constraints Documentation: If you re-create a table that was dropped, it must have a definition that conforms to the foreign key constraints referencing it. It must have the correct column names and types, and it must have indexes on the referenced keys, as stated earlier. If these are not satisfied, MySQL returns Error 1005 and refers to Error 150 in the error message, which means that a foreign key constraint w
log in tour help Tour Start 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 Database Administrators Questions Tags Users Badges Unanswered Ask Question _ Database Administrators Stack Exchange is a question and answer site for database professionals who wish to improve their database skills and learn from others in the community. Join them; it only takes a minute: Sign up Here's how it works: Anybody can ask a question Anybody can answer The best answers are voted up and rise to the top Altering table Foreign Keys produces an error (errno:150) (MySQL) up vote 2 down vote favorite This is the first database I set up so I apologize if my problem is something obvious. I'm playing around with my table design and tried to create some link tables with FKs to avoid redundant data. When I try to sync my EER model with the DB I get an error which makes no sense to me. Executing SQL script in server ERROR: Error 1005: Can't create table 'jonijz1_Test.#sql-d7d_1291db' (errno: 150) ALTER TABLE `jonijz1_Test`.`UserGroupLink` ADD CONSTRAINT `fk_UserGroupLink_UserGroup` FOREIGN KEY (`UserGroupID`) REFERENCES `jonijz1_Test`.`UserGroup` (`UserGroupID`) ON DELETE NO ACTION ON UPDATE NO ACTION, ADD CONSTRAINT `fk_UserGroupLink_Users1` FOREIGN KEY (`UserID`) REFERENCES `jonijz1_Test`.`Users` (`UserID`) ON DELETE NO ACTION ON UPDATE NO ACTION SQL script execution finished: statements: 5 succeeded, 1 failed Fetching back view definitions in final form. Nothing to fetch What am I doing wrong? And on a sidenote: would a design like this make any sense or am I approaching this wrong as well? mysql foreign-key mysql-workbench share|improve this question edited Mar 19 '14 at 22:04 nmad 6134621 asked Mar 19 '14 at 21:04 Jonathan 1185 add a comment| 3 Answers 3 active oldest votes up vote 3 down vote accepted While you seem to have fixed the issue, I will quickly explain why it happened in case anyone finding this will want to understand where the problem was. When setting foreign keys, the Primary Keys Columns must be of exact same type and attrib