MySQL的.无法创建表格errno 150 [英] MySQL. Can't create table errno 150

问题描述

我必须在MySQL中创建一个包含两个表的数据库，但是该脚本因errno 150(外键问题)而失败.我再次检查了两个表上的外键字段是否相同，并且找不到任何错误.

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.

这是脚本:

 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;

我已经在Windows和Ubuntu中使用不同版本的MySQL进行了尝试，但无法正常工作.

I've tried it in Windows and Ubuntu with different versions of MySQL and didn't work.

有什么想法吗?

推荐答案

table1.field1上没有定义索引.

需要在field1上放置FOREIGN KEY约束.

与此:

 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;

然后一切都会按预期进行.

Everything should then work as expected.

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