Question

我正在为学院写一个小的webapp，但我无法弄清楚为什么MySQL脚本无法通过。它说“无法添加外键约束”

这是我正在尝试运行的脚本。

1）我在所有桌子上检查了InnoDB。 2）如果FK有任何错误，但没有任何结果。

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';

CREATE SCHEMA IF NOT EXISTS `bdchile` DEFAULT CHARACTER SET utf8 ;
USE `bdchile` ;

-- -----------------------------------------------------
-- Table `bdchile`.`REGION`
-- -----------------------------------------------------
CREATE  TABLE IF NOT EXISTS `bdchile`.`REGION` (
  `REGION_ID` INT(2) NOT NULL DEFAULT '0' ,
  `REGION_NOMBRE` VARCHAR(50) NOT NULL ,
  PRIMARY KEY (`REGION_ID`) )
ENGINE = InnoDB
DEFAULT CHARACTER SET = utf8;


-- -----------------------------------------------------
-- Table `bdchile`.`PROVINCIA`
-- -----------------------------------------------------
CREATE  TABLE IF NOT EXISTS `bdchile`.`PROVINCIA` (
  `PROVINCIA_ID` INT(3) NOT NULL DEFAULT '0' ,
  `PROVINCIA_NOMBRE` VARCHAR(23) NOT NULL ,
  `REGION_REGION_ID` INT(2) NOT NULL ,
  PRIMARY KEY (`PROVINCIA_ID`) ,
  INDEX `fk_PROVINCIA_REGION_idx` (`REGION_REGION_ID` ASC) ,
  CONSTRAINT `fk_PROVINCIA_REGION`
    FOREIGN KEY (`REGION_REGION_ID` )
    REFERENCES `bdchile`.`REGION` (`REGION_ID` )
    ON DELETE CASCADE
    ON UPDATE CASCADE)
ENGINE = InnoDB
DEFAULT CHARACTER SET = utf8;


-- -----------------------------------------------------
-- Table `bdchile`.`COMUNA`
-- -----------------------------------------------------
CREATE  TABLE IF NOT EXISTS `bdchile`.`COMUNA` (
  `COMUNA_ID` INT(5) NOT NULL DEFAULT '0' ,
  `COMUNA_NOMBRE` VARCHAR(20) NOT NULL ,
  `PROVINCIA_PROVINCIA_ID` INT(3) NOT NULL ,
  PRIMARY KEY (`COMUNA_ID`) ,
  INDEX `fk_COMUNA_PROVINCIA_idx` (`PROVINCIA_PROVINCIA_ID` ASC) ,
  CONSTRAINT `fk_COMUNA_PROVINCIA`
    FOREIGN KEY (`PROVINCIA_PROVINCIA_ID` )
    REFERENCES `bdchile`.`PROVINCIA` (`PROVINCIA_ID` )
    ON DELETE CASCADE
    ON UPDATE CASCADE)
ENGINE = InnoDB
DEFAULT CHARACTER SET = utf8;


-- -----------------------------------------------------
-- Table `bdchile`.`USUARIO`
-- -----------------------------------------------------
CREATE  TABLE IF NOT EXISTS `bdchile`.`USUARIO` (
  `USUARIO_ID` INT(9) NOT NULL ,
  `USUARIO_CLAVE` VARCHAR(12) NOT NULL ,
  `USUARIO_PRIVILEGIO` INT(1) NOT NULL DEFAULT 3 ,
  `USUARIO_ESTADO` INT(1) NOT NULL DEFAULT 1 ,
  PRIMARY KEY (`USUARIO_ID`) )
ENGINE = InnoDB
DEFAULT CHARACTER SET = utf8
PACK_KEYS = 1;


-- -----------------------------------------------------
-- Table `bdchile`.`SEXO`
-- -----------------------------------------------------
CREATE  TABLE IF NOT EXISTS `bdchile`.`SEXO` (
  `SEXO_ID` INT(1) NOT NULL ,
  `SEXO_NOMBRE` VARCHAR(8) NOT NULL ,
  PRIMARY KEY (`SEXO_ID`) )
ENGINE = InnoDB;


-- -----------------------------------------------------
-- Table `bdchile`.`ESTUDIO`
-- -----------------------------------------------------
CREATE  TABLE IF NOT EXISTS `bdchile`.`ESTUDIO` (
  `ESTUDIO_ID` INT(1) NOT NULL ,
  `ESTUDIO_NIVEL` VARCHAR(51) NOT NULL ,
  PRIMARY KEY (`ESTUDIO_ID`) )
ENGINE = InnoDB;


-- -----------------------------------------------------
-- Table `bdchile`.`PERSONA`
-- -----------------------------------------------------
CREATE  TABLE IF NOT EXISTS `bdchile`.`PERSONA` (
  `PERSONA_RUN` INT(10) NOT NULL ,
  `PERSONA_NOMBRES` VARCHAR(45) NOT NULL ,
  `PERSONA_PRIMER_APELLIDO` VARCHAR(20) NOT NULL ,
  `PERSONA_SEGUNDO_APELLIDO` VARCHAR(20) NULL ,
  `PERSONA_FECHA_NACIMIENTO` DATE NOT NULL ,
  `PERSONA_DIRECCION` VARCHAR(45) NOT NULL ,
  `COMUNA_COMUNA_ID` INT(5) NOT NULL ,
  `SEXO_SEXO_ID` INT(1) NOT NULL ,
  `ESTUDIO_ESTUDIO_ID` INT(1) NOT NULL ,
  PRIMARY KEY (`PERSONA_RUN`) ,
  INDEX `fk_PERSONA_COMUNA_idx` (`COMUNA_COMUNA_ID` ASC, `PERSONA_RUN` ASC) ,
  INDEX `fk_PERSONA_SEXO_idx` (`SEXO_SEXO_ID` ASC) ,
  INDEX `fk_PERSONA_ESTUDIO_idx` (`ESTUDIO_ESTUDIO_ID` ASC) ,
  CONSTRAINT `fk_PERSONA_COMUNA`
    FOREIGN KEY (`COMUNA_COMUNA_ID` , `PERSONA_RUN` )
    REFERENCES `bdchile`.`COMUNA` (`COMUNA_ID` , `COMUNA_ID` )
    ON DELETE CASCADE
    ON UPDATE CASCADE,
  CONSTRAINT `fk_PERSONA_SEXO`
    FOREIGN KEY (`SEXO_SEXO_ID` )
    REFERENCES `bdchile`.`SEXO` (`SEXO_ID` )
    ON DELETE CASCADE
    ON UPDATE CASCADE,
  CONSTRAINT `fk_PERSONA_ESTUDIO`
    FOREIGN KEY (`ESTUDIO_ESTUDIO_ID` )
    REFERENCES `bdchile`.`ESTUDIO` (`ESTUDIO_ID` )
    ON DELETE CASCADE
    ON UPDATE CASCADE)
ENGINE = InnoDB;



SET SQL_MODE=@OLD_SQL_MODE;
SET FOREIGN_KEY_CHECKS=@OLD_FOREIGN_KEY_CHECKS;
SET UNIQUE_CHECKS=@OLD_UNIQUE_CHECKS;

，输出就是这样：

**[Err] 1215 - Cannot add foreign key constraint**

Answer 1

在PERSONA表中，您有一个复合外键(fk_PERSONA_COMUNA)，它引用同一列两次。它不会那样工作。

Fiddle

错误1215无法在MySQL上添加外键约束

1 个答案: