Mysql Error 1005 Hy000 121
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Errno 121 Mysql
Can't create table (errno: 121) up vote 81 down vote favorite 21 Im having troubles with forward engineering my MySQL database into WAMP server.. I 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` -- errno 121 linux ----------------------------------------------------- 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` VARCHAR(45) NULL , `status` CHAR NULL , `remarks` VARCHAR(200) NULL , PRIMARY KEY (`wait_id`) ) ENGINE = InnoDB; -- ----------------------------------------------------- -- Table `Schedule` -- ----------------------------------------------------- DROP TABLE IF EXISTS `Schedule` ; CREATE TABLE IF NOT EXISTS `Schedule` ( `lesson_id` VARCHAR(10) NOT NULL , `day` VARCHAR(3) NOT NULL , `branch` VARCHAR(30) NOT NULL , `level` VARCHAR(30) NOT NULL , `time` TIME NOT NULL , `ae` VARCHAR(45) NOT NULL , PRIMARY KEY (`lesson_id`) ) ENGINE = InnoDB; -- ----------------------------------------------------- -- Table `Link` -- -------------
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Mysql Rename Constraint
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 can't create table errno 121 up vote http://stackoverflow.com/questions/12623651/error-error-1005-cant-create-table-errno-121 8 down vote favorite Why am I getting this error? I don't have any foreign keys drop table if exists t_issue; SET foreign_key_checks = 0;SET storage_engine=INNODB; CREATE TABLE `t_issue` ( `id_issue` int(11) NOT NULL PRIMARY KEY AUTO_INCREMENT, `fk_project` int(11) DEFAULT NULL, `subject` varchar(255) DEFAULT NULL, `estimated_due_date` date DEFAULT NULL, `due_date` date DEFAULT NULL, `done_ratio` int(11) DEFAULT NULL, `fk_status` int(11) DEFAULT NULL, `fk_assigned_to` int(11) DEFAULT NULL, `fk_owner` int(11) http://stackoverflow.com/questions/22712553/mysql-cant-create-table-errno-121 DEFAULT NULL ) ENGINE=innodb DEFAULT CHARSET=latin1 mysql share|improve this question asked Mar 28 '14 at 12:14 patentul 5342417 2 Seems to work OK for me. –Malcolm Mar 28 '14 at 12:17 It's working.What error you are facing –Nagaraj S Mar 28 '14 at 12:17 It's work fine for me –Sadikhasan Mar 28 '14 at 12:19 I changed the name of the table to t_issue1 and the query works for that, for t_issue it doesen't. However I did a "Show tables" but no table named t_issue exists. What could the problem be? –patentul Mar 28 '14 at 12:20 1 It is the same previous question from you: Mysql can't create table errno 121 –Ravinder Reddy Mar 28 '14 at 12:28 | show 4 more comments 1 Answer 1 active oldest votes up vote 22 down vote accepted Mysql can't create table errno 121 You will get this message if you are trying to add a constraint with a name that is already used somewhere else. To check constraints, use the following SQL query: SELECT constraint_name, table_name FROM information_schema.table_constraints WHERE constraint_type = 'FOREIGN KEY' AND table_schema = DATABASE() ORDER BY constraint_name; Reference: http://dba.stackexchan
for Developers MariaDB Contributor Agreement MariaDB Contributor Agreement FAQs Community Ambassadors Events Past Events and Conferences Sponsor Sponsors List of Donors Blog About MariaDB Sponsors Governance Logos and Badges MariaDB Trademark Usage Statistics Service https://mariadb.org/mariadb-innodb-foreign-key-constraint-errors/ Providers Maintenance Policy Security Policy Download Learn Get Involved Social Media Getting http://dba.stackexchange.com/questions/24164/error-1005-hy000-cant-create-table-phact-greenland-cache-errno-121 Started for Developers MariaDB Contributor Agreement MariaDB Contributor Agreement FAQs Community Ambassadors Events Past Events and Conferences Sponsor Sponsors List of Donors Blog HomeGeneralMariaDB: InnoDB foreign key constraint errors MariaDB: InnoDB foreign key constraint errors 2015-08-07 4 Comments Written by Jan Lindstrom Introduction A foreign key is a field (or mysql error collection of fields) in one table that uniquely identifies a row of another table. The table containing the foreign key is called the child table, and the table containing the candidate key is called the referenced or parent table. The purpose of the foreign key is to identify a particular row of the referenced table. Therefore, it is required that the foreign key error code 1005 is equal to the candidate key in some row of the primary table, or else have no value (the NULL value). This is called a referential integrity constraint between the two tables. Because violations of these constraints can be the source of many database problems, most database management systems provide mechanisms to ensure that every non-null foreign key corresponds to a row of the referenced table. Consider following simple example: create table parent ( id int not null primary key, name char(80) ) engine=innodb; create table child ( id int not null, name char(80), parent_id int, foreign key(parent_id) references parent(id) ) engine=innodb; As far as I know, the following storage engines for MariaDB and/or MySQL support foreign keys: InnoDB (both innodb_plugin and XtraDB) PBXT (https://mariadb.com/kb/en/mariadb/about-pbxt/) SolidDB for MySQL (http://sourceforge.net/projects/soliddb/) ScaleDB (https://mariadb.com/kb/en/mariadb/scaledb/ and http://scaledb.com/pdfs/TechnicalOverview.pdf) MySQL Cluster NDB 7.3 or later (https://dev.mysql.com/doc/refman/5.6/en/mysql-cluster-ndb-innodb-engines.html) MariaDB foreign key syntax is documented at https://mariadb.com/kb/en/mariadb/foreign-keys/ (and MySQL at http://dev.mysql.com/doc/refman/5.5/en/innodb-foreign-key-constraints.html). While most of the syntax is parsed and checked when the CREATE TABLE or ALTER TABLE clause is parsed, there are still several error cases that can happen inside InnoDB. Yes, InnoDB has i
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 ERROR 1005 (HY000): Can't create table 'phact_greenland.cache' (errno: 121) up vote 2 down vote favorite I get an error when I try to create a table: ERROR 1005 (HY000): Can't create table 'phact_greenland.cache' (errno: 121) CREATE TABLE IF NOT EXISTS `cache` ( `cid` varchar(255) NOT NULL DEFAULT '' COMMENT 'Primary Key: Unique cache ID.' , `data` longblob COMMENT 'A collection of data to cache.' , `expire` int(11) NOT NULL DEFAULT '0' COMMENT 'A Unix timestamp indicating when the cache entry should expire, or 0 for never.' , `created` int(11) NOT NULL DEFAULT '0' COMMENT 'A Unix timestamp indicating when the cache entry was created.' , `serialized` smallint(6) NOT NULL DEFAULT '0' COMMENT 'A flag to indicate whether content is serialized (1) or not (0).' , PRIMARY KEY (`cid`) , KEY `expire` (`expire`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8 COMMENT='Generic cache table for caching things not separated out...'; How do i solve it ? mysql innodb share|improve this question edited Sep 26 '12 at 13:38 Max Vernon 27.1k1160118 asked Sep 12 '12 at 9:40 Dinesh Kumar Sarangapani 15119 Try it again, then run SHOW engine innodb STATUS; and edit your question with the end of the output. –Philį