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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 ERROR: Error 1005: Can't create table (errno: 121) up vote 80 down vote favorite 21 Im having troubles with forward engineering my MySQL database into WAMP server.. I 1005 can't create table errno 121 was going to post an image of the schema but as this is my first post i can't.. Below is the executed script.. use aquaticstar; SET @OLD_UNIQUE_CHECKS=@@UNIQUE_CHECKS, UNIQUE_CHECKS=0; SET @OLD_FOREIGN_KEY_CHECKS=@@FOREIGN_KEY_CHECKS, FOREIGN_KEY_CHECKS=0; SET @OLD_SQL_MODE=@@SQL_MODE, SQL_MODE='TRADITIONAL,ALLOW_INVALID_DATES'; -- ----------------------------------------------------- -- Table `Students` -- ----------------------------------------------------- DROP TABLE IF EXISTS `Students` ; CREATE TABLE IF NOT EXISTS `Students` ( `id` VARCHAR(10) NOT NULL , `studentName` VARCHAR(45) NOT NULL , `gender` CHAR NOT NULL , `birthDate` DATETIME NOT NULL , `mNo` VARCHAR(10) NOT NULL , `contactName` VARCHAR(45) NOT NULL , `contactEmail` VARCHAR(45) NOT NULL , `contactPhone` INT(10) NOT NULL , `startDate` DATETIME NOT NULL , `remarks` VARCHAR(200) NULL , PRIMARY KEY (`id`) ) ENGINE = InnoDB; -- ----------------------------------------------------- -- Table `Waiting List` -- ----------------------------------------------------- DROP TABLE IF EXISTS `Waiting List` ; CREATE TABLE IF NOT EXISTS `Waiting List` ( `wait_id` VARCHAR(5) NOT NULL , `name` VARCHAR(45) NULL , `contactName` VARCHAR(45) NULL , `contactPhone` INT(10) NULL , `contactEmail` VAR

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 mysql error code 1005 errno 150 or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x mysql error code 1005. can't create table (errno 150) 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 errno 121 linux only takes a minute: Sign up MySQL Foreign Key Can't create table error:121 up vote 0 down vote favorite I've two tables CREATE TABLE `patient_doctor_decision` ( `id` bigint(50) NOT NULL, `help_entity_id` bigint(50) NOT NULL, `description` varchar(100) DEFAULT NULL, PRIMARY KEY http://stackoverflow.com/questions/12623651/error-error-1005-cant-create-table-errno-121 (`id`) ); CREATE TABLE `help_entity` ( `id` bigint(50) NOT NULL AUTO_INCREMENT, `type` int(50) NOT NULL, `comments` varchar(100) DEFAULT NULL, PRIMARY KEY (`id`) ); Both tables already have a lot of data. I want to establish a FK relationship on patient_doctor_decision.help_entity_id field with help_entity.id field. ALTER TABLE `patient_doctor_decision` ADD CONSTRAINT `fk_help_entity` FOREIGN KEY (`help_entity_id`) REFERENCES `help_entity`(`id`); I've verified that foreign keys are valid and there is no foreign key which is not present in the referenced table as primary key. SELECT http://stackoverflow.com/questions/14598948/mysql-foreign-key-cant-create-table-error121 * FROM patient_doctor_decision d WHERE d.help_entity_id NOT IN ( SELECT id FROM help_entity); 0 rows are returned. But when I execute the Alter statement mentioned above, I get this error ERROR 1005: Can't create table 'mydb.#sql-57c_9' (errno: 121) Please suggest. mysql foreign-keys share|improve this question asked Jan 30 '13 at 7:46 Ali 1,86081738 Are both tables InnoDB? –Explosion Pills Jan 30 '13 at 7:49 Yes both are InnoDB –Ali Jan 30 '13 at 7:53 2 There's not already an fk_help_entity in the table? –Explosion Pills Jan 30 '13 at 7:57 Isn't it because you are using NOT IN? –user1121883 Jan 30 '13 at 8:00 Can i know after established relationship which type of result you wanted ? –Md. Maruf Hossain Jan 30 '13 at 8:02 | show 3 more comments 1 Answer 1 active oldest votes up vote 0 down vote Well, I didn't got the exact thing working but changing the foreign key constraint name worked for me. share|improve this answer answered Jan 30 '13 at 8:23 Ali 1,86081738 add a comment| Your Answer draft saved draft discarded Sign up or log in Sign up using Google Sign up using Facebook Sign up using Email and Password Post as a guest Name Email Post as a guest Name Email discard By posting your answer, you agree to the privacy policy and terms of service. Not the an

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 http://dba.stackexchange.com/questions/69656/cant-create-table-but-table-doesnt-exist and policies of this site About Us Learn more about Stack Overflow http://thenoyes.com/littlenoise/?p=81 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 create table 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 Can't create table, but table doesn't exist up vote 4 down vote favorite 3 I'm using these steps to create a table my_user, that already existed but can't create table somehow vanished from my database my_db: mysql> USE my_db; mysql> DROP TABLE my_user; mysql> ERROR 1051 (42S02): Unknown table 'my_user' mysql> CREATE TABLE my_user (id INT AUTO_INCREMENT NOT NULL, username VARCHAR(255), group_id VARCHAR(255) DEFAULT NULL, PRIMARY KEY(id)) DEFAULT CHARACTER SET utf8 COLLATE utf8_unicode_ci ENGINE = InnoDB; mysql> ERROR 1005 (HY000): Can't create table 'my_db.my_user' (errno: -1) Tried # mysqladmin flush-tables and repeated the steps above but it wasn't helpful. Also, restarted the mysql service, but no good. Any ideas? Google has failed me so far. Thanks. Extra info: mysql> SHOW engine innodb STATUS; ------------------------ LATEST FOREIGN KEY ERROR ------------------------ 140703 15:15:09 Error in foreign key constraint of table my_db/my_user there is no index in the table which would contain the columns as the first columns, or the data types in the table do not match the ones in the referenced table or one of the ON ... SET NULL columns is declared NOT NULL. Constraint: , CONSTRAINT "FK_CFBD431E285FAC6D" FOREIGN KEY ("group_id") REFERENCES "my_group" ("id") mysql innodb share|improve this question edited Jul 3 '14 at 15:31 asked Jul 3 '14

perror 121 says this? MySQL error code 121: Duplicate key on write or update Really confused how you might get a duplicate key error while creating a table? If the table you're trying to create includes a foreign key constraint, and you've provided your own name for that constraint, remember that it must be unique within the database. Run this query to see if that name is in use somewhere: SELECT constraint_name, table_name FROM information_schema.table_constraints WHERE constraint_type = 'FOREIGN KEY' AND table_schema = DATABASE() ORDER BY constraint_name; (If you're still on 4.1 or earlier, mysqldump --no-data yourDbName | grep CONSTRAINT to get a similar list) Thanks to [raymond] on Freenode. Share this:TweetMoreShare on TumblrPocket Filed under: MySQL FAQ Leave a comment Comments (14) Trackbacks (3) ( subscribe to comments on this post ) Álvaro G. VicarioApril 27th, 2010 - 11:20 In my case, it was an ALTER TABLE … ADD CONSTRAINT query and the name was in use by an index. JamesAugust 11th, 2010 - 12:48 Thank you very much. Worked like a charm. ArtemAugust 23rd, 2010 - 10:36 Thanks a lot! SenthilSeptember 4th, 2010 - 07:25 Great !! It worked. DUSMANTA SAHOONovember 20th, 2012 - 01:35 Thank you so much!!!! It worked ChandrababuDecember 1st, 2012 - 02:51 Thanks for post solution for ErrorNo:121, now my DB successfully executed, once again thanks to u… Furkan ÇakmakDecember 4th, 2012 - 05:30 Thank you very much. I have been tried so many things last two hours and I have fixed errors thanks to your note. JoshDecember 13th, 2012 - 21:34 Amazing. Thank you! From San Diego, Josh Per OlesenJanuary 6th, 2013 - 08:15 Awesomeness your way. Thanks! AshtonApril 1st, 2013 - 18:48 Me and my professor have been searching for 2 weeks on how to fix this problem and finally someone pulled through! -Thanks!! meApril 12t

 

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