Question

I’ve searched for answers might work, but didn’t fix.

I’ve created tables like this and when created table ‘hobbies’ got error 1072.

CREATE  TABLE IF NOT EXISTS `project_r`.`user` (
  `user_id` INT NOT NULL ,
  `password` VARCHAR(45) NOT NULL ,
  `RealName` VARCHAR(45) NOT NULL ,
  `FamilyName` VARCHAR(45) NOT NULL ,
  `birthdate` VARCHAR(45) NOT NULL ,
  `Homecity` VARCHAR(45) NOT NULL ,
  `school_id` INT NOT NULL ,
  `school_enteryear` INT NOT NULL ,
  `email` VARCHAR(45) NULL ,
  `activestat` VARCHAR(45) NULL ,
  `onlinestat` VARCHAR(45) NULL ,
  `regtime` DATETIME NOT NULL ,
  `avatar` VARCHAR(45) NULL ,
  `status` VARCHAR(45) NULL ,
  `desc` VARCHAR(45) NULL ,
  `self_comment` VARCHAR(45) NULL ,
  `userMsg_id` INT NOT NULL ,
  PRIMARY KEY (`user_id`) ,
  INDEX `fk_user_school1_idx` (`school_id` ASC) ,
  CONSTRAINT `fk_user_school1`
    FOREIGN KEY (`school_id` )
    REFERENCES `project_r`.`school` (`school_id` )
    ON DELETE NO ACTION
    ON UPDATE NO ACTION)
ENGINE = InnoDB;

then and create table ‘hobbies’

CREATE  TABLE IF NOT EXISTS `project_r`.`hobbies` (
  `hobby_user_id` INT NOT NULL ,
  `favorite_music` VARCHAR(45) NULL ,
  `favorite_game` VARCHAR(20) NULL ,
  `favorite_film` VARCHAR(45) NULL ,
  `favorite_book` VARCHAR(45) NULL ,
  `favorite_sport` VARCHAR(45) NULL ,
  `favorite_cartoon` VARCHAR(45) NULL ,
  `hobby` VARCHAR(45) NULL ,
  PRIMARY KEY (`user_id`) ,
  INDEX `fk_user_id` (`hobby_user_id` ASC) ,
  CONSTRAINT `fk_user_id`
    FOREIGN KEY (`hobby_user_id` )
    REFERENCES `project_r`.`user` (`user_id` )
    ON DELETE NO ACTION
    ON UPDATE NO ACTION)
ENGINE = InnoDB;

both AUTO-INCREMENT things added or not or index added to referenced tables didn’t work.
thx for help.

Answer 1

You are setting a PRIMARY KEY on a column user_id in hobbies, but there is no such column. It is called hobby_user_id.

 PRIMARY KEY (`hobby_user_id`) ,

A quick test in my own database successfully creates these two tables with the correct PRIMARY KEY spec.