Question

I have used MySQL Workbench to model my table and somehow there’s a logic error in the SQL to create the tables generated by the software.

Here are the codes:

-- -----------------------------------------------------
-- Table `trickani_main`.`user`
-- -----------------------------------------------------
CREATE  TABLE IF NOT EXISTS `trickani_main`.`user` (
  `iduser` INT UNSIGNED NOT NULL AUTO_INCREMENT ,
  `fb_id` VARCHAR(50) NOT NULL ,
  `email` VARCHAR(40) NOT NULL ,
  `first_name` VARCHAR(15) NOT NULL ,
  `gender` VARCHAR(1) NOT NULL ,
  PRIMARY KEY (`iduser`) ,
  UNIQUE INDEX `fb_id_UNIQUE` (`fb_id` ASC) ,
  UNIQUE INDEX `email_UNIQUE` (`email` ASC) )
ENGINE = InnoDB
AUTO_INCREMENT = 1;


-- -----------------------------------------------------
-- Table `trickani_main`.`quiz_list`
-- -----------------------------------------------------
CREATE  TABLE IF NOT EXISTS `trickani_main`.`quiz_list` (
  `id_quiz_list` INT UNSIGNED NOT NULL AUTO_INCREMENT ,
  `difficult` TINYINT(4) NOT NULL ,
  PRIMARY KEY (`id_quiz_list`) )
ENGINE = InnoDB;


-- -----------------------------------------------------
-- Table `trickani_main`.`user_quiz_list`
-- -----------------------------------------------------
CREATE  TABLE IF NOT EXISTS `trickani_main`.`user_quiz_list` (
  `iduser` INT UNSIGNED NOT NULL ,
  `id_quiz_list` INT UNSIGNED NOT NULL ,
  `level_reached` INT UNSIGNED NOT NULL DEFAULT 0 ,
  PRIMARY KEY (`iduser`, `id_quiz_list`) ,
  INDEX `fk_quiz_list_user1_idx` (`iduser` ASC) ,
  INDEX `fk_user_quiz_list_quiz_list1_idx` (`id_quiz_list` ASC) ,
  CONSTRAINT `fk_quiz_list_user1`
    FOREIGN KEY (`iduser` )
    REFERENCES `trickani_main`.`user` (`iduser` )
    ON DELETE CASCADE
    ON UPDATE CASCADE,
  CONSTRAINT `fk_user_quiz_list_quiz_list1`
    FOREIGN KEY (`id_quiz_list` )
    REFERENCES `trickani_main`.`quiz_list` (`id_quiz_list` )
    ON DELETE NO ACTION
    ON UPDATE NO ACTION)
ENGINE = InnoDB
AUTO_INCREMENT = 1;

As result I’m getting the following message:

#1005 – Can’t create table ‘trickani_main.quiz_level’ (errno: 150)

I don’t get it! I can’t see any error even by reading the code itself!

Any help?

Answer 1

You might want to try making your PKs not unsigned.

See this question/answer: Adding table with FOREIGN KEY to a MySQL database causes errno 150

Edit: you might want to try either making all your PKs signed or all your PKs unsigned. My guess is that the definition for quiz_level, which isn’t currently shown in your question, has a PK whose signedness differs from the other tables.