I have to create a database with two tables in MySQL, but the script fails with errno 150 (foreign key problem). I double-checked the foreign key fields to be the same on both tables, and I can't find any error.
Here is the script:
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';
DROP SCHEMA IF EXISTS `testdb`;
CREATE SCHEMA IF NOT EXISTS `testdb` DEFAULT CHARACTER SET utf8 COLLATE utf8_unicode_ci ;
USE `testdb`;
DROP TABLE IF EXISTS `testdb`.`table1` ;
CREATE TABLE IF NOT EXISTS `testdb`.`table1` (
`id` INT UNSIGNED NOT NULL ,
`field1` VARCHAR(50) NULL ,
PRIMARY KEY (`id`) )
ENGINE = InnoDB;
DROP TABLE IF EXISTS `testdb`.`table2` ;
CREATE TABLE IF NOT EXISTS `testdb`.`table2` (
`id` INT NOT NULL AUTO_INCREMENT ,
`field1` VARCHAR(50) NULL ,
`date` DATE NULL ,
`cnt` INT NULL ,
PRIMARY KEY (`id`) ,
INDEX `FK_table2_table1` (`field1` ASC) ,
CONSTRAINT `FK_table2_table1`
FOREIGN KEY (`field1`)
REFERENCES `testdb`.`table1` (`field1` )
ON DELETE NO ACTION
ON UPDATE NO ACTION)
ENGINE = InnoDB;
SET SQL_MODE=@OLD_SQL_MODE;
SET FOREIGN_KEY_CHECKS=@OLD_FOREIGN_KEY_CHECKS;
SET UNIQUE_CHECKS=@OLD_UNIQUE_CHECKS;
I've tried it in Windows and Ubuntu with different versions of MySQL and didn't work.
Any ideas?
table1.field1
has no index defined on it.
It is required to place a FOREIGN KEY
constraint on field1
.
With this:
CREATE TABLE IF NOT EXISTS `testdb`.`table1` (
`id` INT UNSIGNED NOT NULL ,
`field1` VARCHAR(50) NULL ,
KEY ix_table1_field1 (field1),
PRIMARY KEY (`id`) )
ENGINE = InnoDB;
Everything should then work as expected.