Foreign Key Error Mysql
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Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. cannot add or update a child row a foreign key constraint fails mysql 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 https://dev.mysql.com/doc/refman/5.6/en/create-table-foreign-keys.html 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 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 http://stackoverflow.com/questions/1457305/mysql-creating-tables-with-foreign-keys-giving-errno-150 `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 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 be the same data type. (if the PRIMARY Key in the Parent table is UNSIGNED, be sure to select UNSIGNED in the Child Table field) The PK column(s) in the parent table and the FK column(s), if they have a define collation type, must have the same collation type; If there is data already in th
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 http://stackoverflow.com/questions/12966626/mysql-cannot-add-or-update-a-child-row-a-foreign-key-constraint-fails 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 you, helping each other. Join them; it only takes a minute: Sign up MySQL - Cannot add or update a child row: a foreign key constraint fails up vote 6 down vote favorite This seems to be a common error, but for the life of me I foreign key can't figure this out. I have a set of InnoDB user tables in MySQL that are tied together via foreign key; the parent user table, and a set of child tables that store email addresses, actions, etc. These are all tied to the parent user table by a foreign key, uid, with all of the parent and child keys being int(10). All of the child tables have a uid value with a foreign key constraint pointing to user.uid, and set to foreign key constraint ON DELETE CASCADE and ON UPDATE CASCADE. When I delete a user from user, all of the child constrained entries are removed. However, when I attempt to update a user.uid value, it results in the following error, rather than cascading the uid change to the child tables: #1452 - Cannot add or update a child row: a foreign key constraint fails (`accounts`.`user_email`, CONSTRAINT `user_email_ibfk_2` FOREIGN KEY (`uid`) REFERENCES `user` (`uid`) ON DELETE CASCADE ON UPDATE CASCADE) I have a feeling I must be missing something obvious here. Removing the key constraint with user_email and attempting to update the value in user results in the same error but for the next alphabetical user child table, so I don't believe it is a table-specific error. EDIT: Adding in the results from SHOW ENGINE INNODB STATUS: ------------------------ LATEST FOREIGN KEY ERROR ------------------------ 121018 22:35:41 Transaction: TRANSACTION 0 5564387, ACTIVE 0 sec, process no 1619, OS thread id 2957499248 updating or deleting, thread declared inside InnoDB 499 mysql tables in use 1, locked 1 17 lock struct(s), heap size 2496, 9 row lock(s), undo log entries 2 MySQL thread id 3435659, query id 24068634 localhost root Updating UPDATE `accounts`.`user` SET `uid` = '1' WHERE `user`.`uid` = 306 Foreign key constraint fails for table `accounts`.`user_email`: , CONSTRAINT `user_email_ibfk_2` FOREIGN KEY (`uid`) REFERENCES `user` (`uid`) ON DELETE CASCADE ON UPDATE CASCADE Trying to add in child table, in index `uid` tuple: DATA TUPLE: 2 fi