phpMyAdamin中的SQL腳本錯誤 - 外鍵約束

Question

我正在創建一個SQL腳本並將其導入到phpMyAdmin中。下面是代碼：

DROP DATABASE IF EXISTS Carpool; 
CREATE DATABASE Carpool; 
USE Carpool; 

CREATE TABLE IF NOT EXISTS users (
    username varchar(100) NOT NULL, 
    firstname varchar(100) NOT NULL, 
    lastname varchar(100) NOT NULL, 
    age   int(10)   NOT NULL, 
    email  varchar(100) NOT NULL, 
    gender  varchar(1)  NOT NULL, 
    passhash varchar(100) NOT NULL, 
    PRIMARY KEY(username) 
); 

CREATE TABLE IF NOT EXISTS cars (
    car_id  int(50)  NOT NULL AUTO_INCREMENT, 
    cartype  varchar(50), 
    neatness varchar(50), 
    color  varchar(50), 
    seats  int(50), 
PRIMARY KEY(car_id) 
); 

CREATE TABLE IF NOT EXISTS startinglocation (
    startinglocation_id int(100)  NOT NULL AUTO_INCREMENT, 
    address    varchar(200) NOT NULL, 
    zipcode    varchar(50)  NOT NULL, 
    city    varchar(50)  NOT NULL, 
    state    varchar(50)  NOT NULL, 
    longitude   float(10)  NOT NULL, 
    latitude   float(10)  NOT NULL, 
PRIMARY KEY(startinglocation_id) 
); 

CREATE TABLE IF NOT EXISTS endinglocation (
    endinglocation_id int(100)  NOT NULL AUTO_INCREMENT, 
    address    varchar(200) NOT NULL, 
    zipcode    varchar(50)  NOT NULL, 
    city    varchar(50)  NOT NULL, 
    state    varchar(50)  NOT NULL, 
    longitude   float(10)  NOT NULL, 
    latitude   float(10)  NOT NULL, 
PRIMARY KEY(endinglocation_id) 
); 

CREATE TABLE IF NOT EXISTS carpool (

    car_id    int(50), 
    carpool_id   int(50) NOT NULL AUTO_INCREMENT, 
    datetime   varchar(50), 
    duration   varchar(50), 
    numberofpassengers int(10), 
    startingtime  varchar(50) NOT NULL, 
    endingtime   varchar(50) NOT NULL, 
    recurrencelevel  int(10), 
    startinglocation_id int(100), 
    endinglocation_id int(100), 
PRIMARY KEY(carpool_id), 
FOREIGN KEY(car_id) 
    REFERENCES cars(car_id) 
    ON DELETE SET NULL ON UPDATE CASCADE, 
FOREIGN KEY(startinglocation_id) 
    REFERENCES startinglocation(startinglocation_id) 
    ON DELETE SET NULL ON UPDATE CASCADE, 
FOREIGN KEY(endinglocation_id) 
    REFERENCES endinglocation(endinglocation_id) 
    ON DELETE SET NULL ON UPDATE CASCADE 
); 

CREATE TABLE IF NOT EXISTS driver (
    username varchar(50) NOT NULL, 
    carpool_id int(50)  NOT NULL, 
FOREIGN KEY (username) 
    REFERENCES users(username) 
    ON DELETE SET NULL ON UPDATE CASCADE, 
FOREIGN KEY (carpool_id) 
    REFERENCES carpool(carpool_id) 
    ON DELETE SET NULL ON UPDATE CASCADE 
); 

CREATE TABLE IF NOT EXISTS passenger (
    username  varchar(50) NOT NULL, 
    carpool_id  int(50)  NOT NULL, 
FOREIGN KEY (username) 
    REFERENCES users(username) 
    ON DELETE SET NULL ON UPDATE CASCADE, 
FOREIGN KEY (carpool_id) 
    REFERENCES carpool(carpool_id) 
    ON DELETE SET NULL ON UPDATE CASCADE 
); 

GRANT SELECT, INSERT, UPDATE, DELETE 
ON * 
TO mgs_user 
IDENTIFIED BY 'Password1'; 

而且我收到這樣的錯誤報告：

錯誤 SQL查詢：

CREATE TABLE IF NOT EXISTS carpool (

    car_id    int(50), 
    carpool_id   int(50) NOT NULL AUTO_INCREMENT, 
    datetime   varchar(50), 
    duration   varchar(50), 
    numberofpassengers int(10), 
    startingtime  varchar(50) NOT NULL, 
    endingtime   varchar(50) NOT NULL, 
    recurrencelevel  int(10), 
    startinglocation_id int(100), 
    endinglocation_id int(100), 
PRIMARY KEY(carpool_id), 
FOREIGN KEY(car_id) 
    REFERENCES cars(car_id) 
    ON DELETE SET NULL ON UPDATE CASCADE, 
FOREIGN KEY(startinglocation_id) 
    REFERENCES startinglocation(startinglocation_id) 
    ON DELETE SET NULL ON UPDATE CASCADE, 
FOREIGN KEY(endinglocation_id) 
    REFERENCES endinglocation(endinglocation_id) 
    ON DELETE SET NULL ON UPDATE CASCADE 
) 

MySQL表示：文件

1005 - 燦」 t創建表carpool。 （錯誤：150「外鍵約束不正確」）（詳細信息...）

我覺得我正確地引用了外鍵的表格，但是我已經嘗試了一些小改動但沒有成功。

Answer 1

carpool表引用了startinglocation和endinglocation表，因此需要在表之後創建表。

只需在腳本開始處更改創建順序，執行startinglocation和endinglocation表，它應該可以工作。

@Paul Spiegel向您提出了問題第二部分的答案：driver和passenger表引用users.username以不同類型。