MySQL error 1005 when creating a table
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13-12-2019 - |
题
When running the following statement:
CREATE TABLE `intelischool`.`facultyclasses` (
`id` VARCHAR(45) NOT NULL ,
`class` VARCHAR(45) NOT NULL ,
`subject` VARCHAR(45) NOT NULL ,
`year` VARCHAR(45) NOT NULL ,
`section` VARCHAR(45) NOT NULL ,
PRIMARY KEY (`id`, `section`, `year`, `subject`, `class`) ,
INDEX `id` (`id` ASC) ,
CONSTRAINT `id`
FOREIGN KEY (`id` )
REFERENCES `intelischool`.`faculty` (`id` )
ON DELETE NO ACTION
ON UPDATE NO ACTION)
I get the error:
ERROR 1005: Can't create table 'intelischool.facultyclasses' (errno: 121)
解决方案
This mailing list thread is about the same problem, and the conclusion reached there was that it was caused by a duplicate constraint name.
You probably have another
CONSTRAINT `id`
in another table of the same databse. Those names need to be unique per database. Give it a name like
CONSTRAINT `facultyclasses_foreignkey`
or just delete that line and let the database generate a name for it automatically.
其他提示
Missing comma before Foreign key defination
otherwise
Dropped the tables and created them with an index (instead of adding an index to an already created tables)
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