mysql - 错误 : Error 1005: Can't create table (errno: 121)

Question

我在将我的 MySQL 数据库正向工程 转换为 WAMP 服务器时遇到了麻烦。我本来打算发布架构的图像，但由于这是我的第一篇文章，所以我不能。

下面是执行的脚本..

use aquaticstar;

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';

-- -----------------------------------------------------
-- Table `Students`
-- -----------------------------------------------------
DROP TABLE IF EXISTS `Students` ;

CREATE  TABLE IF NOT EXISTS `Students` (
  `id` VARCHAR(10) NOT NULL ,
  `studentName` VARCHAR(45) NOT NULL ,
  `gender` CHAR NOT NULL ,
  `birthDate` DATETIME NOT NULL ,
  `mNo` VARCHAR(10) NOT NULL ,
  `contactName` VARCHAR(45) NOT NULL ,
  `contactEmail` VARCHAR(45) NOT NULL ,
  `contactPhone` INT(10) NOT NULL ,
  `startDate` DATETIME NOT NULL ,
  `remarks` VARCHAR(200) NULL ,
  PRIMARY KEY (`id`) )
ENGINE = InnoDB;

-- -----------------------------------------------------
-- Table `Waiting List`
-- -----------------------------------------------------
DROP TABLE IF EXISTS `Waiting List` ;

CREATE  TABLE IF NOT EXISTS `Waiting List` (
  `wait_id` VARCHAR(5) NOT NULL ,
  `name` VARCHAR(45) NULL ,
  `contactName` VARCHAR(45) NULL ,
  `contactPhone` INT(10) NULL ,
  `contactEmail` VARCHAR(45) NULL ,
  `status` CHAR NULL ,
  `remarks` VARCHAR(200) NULL ,
  PRIMARY KEY (`wait_id`) )
ENGINE = InnoDB;

-- -----------------------------------------------------
-- Table `Schedule`
-- -----------------------------------------------------
DROP TABLE IF EXISTS `Schedule` ;

CREATE  TABLE IF NOT EXISTS `Schedule` (
  `lesson_id` VARCHAR(10) NOT NULL ,
  `day` VARCHAR(3) NOT NULL ,
  `branch` VARCHAR(30) NOT NULL ,
  `level` VARCHAR(30) NOT NULL ,
  `time` TIME NOT NULL ,
  `ae` VARCHAR(45) NOT NULL ,
  PRIMARY KEY (`lesson_id`) )
ENGINE = InnoDB;

-- -----------------------------------------------------
-- Table `Link`
-- -----------------------------------------------------
DROP TABLE IF EXISTS `Link` ;

CREATE  TABLE IF NOT EXISTS `Link` (
  `link_id` VARCHAR(10) NOT NULL ,
  `id` VARCHAR(10) NOT NULL ,
  `lesson_id` VARCHAR(10) NOT NULL ,
  PRIMARY KEY (`link_id`) ,
  INDEX `id_idx` (`id` ASC) ,
  INDEX `lesson_id_idx` (`lesson_id` ASC) ,
  CONSTRAINT `id`
    FOREIGN KEY (`id` )
    REFERENCES `Students` (`id` )
    ON DELETE NO ACTION
    ON UPDATE NO ACTION,
  CONSTRAINT `lesson_id`
    FOREIGN KEY (`lesson_id` )
    REFERENCES `Schedule` (`lesson_id` )
    ON DELETE NO ACTION
    ON UPDATE NO ACTION)
ENGINE = InnoDB;

-- -----------------------------------------------------
-- Table `Attendance`
-- -----------------------------------------------------
DROP TABLE IF EXISTS `Attendance` ;

CREATE  TABLE IF NOT EXISTS `Attendance` (
  `date` DATETIME NOT NULL ,
  `attendance` VARCHAR(5) NOT NULL ,
  `link_id` VARCHAR(10) NOT NULL ,
  INDEX `link_id_idx` (`link_id` ASC) ,
  CONSTRAINT `link_id`
    FOREIGN KEY (`link_id` )
    REFERENCES `Link` (`link_id` )
    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;

-- -----------------------------------------------------
-- Data for table `Students`
-- -----------------------------------------------------
START TRANSACTION;
INSERT INTO `Students` (`id`, `studentName`, `gender`, `birthDate`, `mNo`, `contactName`, `contactEmail`, `contactPhone`, `startDate`, `remarks`) VALUES ('s001', 'Sam Khew', 'm', '12/12/1991', 'nm', 'May Khew', 'may@gmail.com', 0198829387, '12/07/2011', NULL);
INSERT INTO `Students` (`id`, `studentName`, `gender`, `birthDate`, `mNo`, `contactName`, `contactEmail`, `contactPhone`, `startDate`, `remarks`) VALUES ('s002', 'Joe Biden', 'm', '13/03/2003', 'nm', 'Layla Biden', 'layla@gmail.com', 0199283763, '14/05/2011', NULL);
INSERT INTO `Students` (`id`, `studentName`, `gender`, `birthDate`, `mNo`, `contactName`, `contactEmail`, `contactPhone`, `startDate`, `remarks`) VALUES ('s003', 'Bob Builder', 'm', '14/02/2002', 'LK920K', 'Mama Builder', 'mama@yahoo.com', 0167728376, '29/02/2012', NULL);
INSERT INTO `Students` (`id`, `studentName`, `gender`, `birthDate`, `mNo`, `contactName`, `contactEmail`, `contactPhone`, `startDate`, `remarks`) VALUES ('s004', 'Kenny Koh', 'm', '18/02/1999', 'MM992', 'Lisa Koh', 'lk@hotmail.com', 0123160231, '19/01/2012', NULL);
INSERT INTO `Students` (`id`, `studentName`, `gender`, `birthDate`, `mNo`, `contactName`, `contactEmail`, `contactPhone`, `startDate`, `remarks`) VALUES ('s005', 'Jane Doe', 'f', '29/09/1999', 'nm', 'Jackie Doe', 'jackied@gmail.com', 0127736254, '02/03/2012', NULL);
INSERT INTO `Students` (`id`, `studentName`, `gender`, `birthDate`, `mNo`, `contactName`, `contactEmail`, `contactPhone`, `startDate`, `remarks`) VALUES ('s006', 'Lola Lai', 'f', '02/05/2004', 'nm', 'Mark Lai', 'mark@gmail.com', 0198827365, '11/09/2011', NULL);

COMMIT;

-- -----------------------------------------------------
-- Data for table `Schedule`
-- -----------------------------------------------------
START TRANSACTION;
INSERT INTO `Schedule` (`lesson_id`, `day`, `branch`, `level`, `time`, `ae`) VALUES ('sat1_s4', 'Sat', 'Sunway', 'basic', '4pm', 'Aini');
INSERT INTO `Schedule` (`lesson_id`, `day`, `branch`, `level`, `time`, `ae`) VALUES ('sat1_s5', 'Sat', 'Sunway', 'basic', '5pm', 'Aini');
INSERT INTO `Schedule` (`lesson_id`, `day`, `branch`, `level`, `time`, `ae`) VALUES ('sat1_s6', 'Sat', 'Sunway', 'basic', '6pm', 'Aini');
INSERT INTO `Schedule` (`lesson_id`, `day`, `branch`, `level`, `time`, `ae`) VALUES ('sat2_s4', 'Sat', 'Sunway', 'advance', '4pm', 'Nina');
INSERT INTO `Schedule` (`lesson_id`, `day`, `branch`, `level`, `time`, `ae`) VALUES ('sat2_s5', 'Sat', 'Sunway', 'advance', '5pm', 'Nina');
INSERT INTO `Schedule` (`lesson_id`, `day`, `branch`, `level`, `time`, `ae`) VALUES ('sat3_s6', 'Sat', 'Sunway', 'pre-comp', '6pm', 'Marcus');

COMMIT;

-- -----------------------------------------------------
-- Data for table `Link`
-- -----------------------------------------------------
START TRANSACTION;
INSERT INTO `Link` (`link_id`, `id`, `lesson_id`) VALUES ('L001', 's001', 'sat1_s4');
INSERT INTO `Link` (`link_id`, `id`, `lesson_id`) VALUES ('L002', 's002', 'sat1_s5');
INSERT INTO `Link` (`link_id`, `id`, `lesson_id`) VALUES ('L003', 's003', 'sat1_s6');
INSERT INTO `Link` (`link_id`, `id`, `lesson_id`) VALUES ('L004', 's004', 'sat2_s4');
INSERT INTO `Link` (`link_id`, `id`, `lesson_id`) VALUES ('L005', 's005', 'sat1_s5');

COMMIT;

-- -----------------------------------------------------
-- Data for table `Attendance`
-- -----------------------------------------------------
START TRANSACTION;
INSERT INTO `Attendance` (`date`, `attendance`, `link_id`) VALUES ('26/9/2012', '1', NULL);

COMMIT;

但是我得到了这个错误:

Executing SQL script in server
ERROR: Error 1005: Can't create table 'aquaticstar.link' (errno: 121)

我不知道为什么。谁能帮帮我？

Answer 1

我很快就找到了你，它给我带来了here .我引用:

You will get this message if you're trying to add a constraint with a name that's already used somewhere else

要检查约束，请使用以下 SQL 查询:

SELECT
    constraint_name,
    table_name
FROM
    information_schema.table_constraints
WHERE
    constraint_type = 'FOREIGN KEY'
AND table_schema = DATABASE()
ORDER BY
    constraint_name;

在那里寻找更多信息，或尝试查看错误发生的位置。在我看来，外键有问题。