無法創建SQL表 - 定義了錯誤1005

Question

我不被允許創建下表。是因爲複合主鍵嗎？我還爲用戶和標題表添加了信息，以防代碼中存在問題。

CREATE TABLE store 
(
    short_name VARCHAR(5)      NOT NULL, 
    name  VARCHAR(30)      NOT NULL, 
    address1 VARCHAR(50)      NOT NULL, 
    address2 VARCHAR(20), 
    city  VARCHAR(30)      NOT NULL, 
    state  VARCHAR(30)      NOT NULL, 
    zip   VARCHAR(10)      NOT NULL, 
    phone  VARCHAR(15)      NOT NULL, 
    CONSTRAINT store_pk PRIMARY KEY (short_name) 
); 

CREATE TABLE publishers 
(
    name  VARCHAR(50)       NOT NULL, 
    status  TINYINT   DEFAULT 1   NOT NULL, 
    CONSTRAINT publishers_pk PRIMARY KEY (name) 
); 
CREATE TABLE users 
(
    id   INT      NOT NULL AUTO_INCREMENT, 
    name  VARCHAR(70)      NOT NULL, 
    password VARCHAR(60),   
    address1 VARCHAR(50)      NOT NULL, 
    address2 VARCHAR(20), 
    city  VARCHAR(30)      NOT NULL, 
    state  VARCHAR(30)      NOT NULL, 
    zip   VARCHAR(10)      NOT NULL, 
    phone  VARCHAR(15), 
    email  VARCHAR(90), 
    store  VARCHAR(5), 
    admin  TINYINT    DEFAULT 0 NOT NULL, 
    mail_list TINYINT    DEFAULT 0 NOT NULL, 
    active  TINYINT    DEFAULT 0 NOT NULL, 
    CONSTRAINT users_pk PRIMARY KEY (id), 
    CONSTRAINT users_fk FOREIGN KEY (store) 
     REFERENCES store (short_name) 
     ON DELETE SET NULL 
     ON UPDATE CASCADE 
); 

CREATE TABLE titles 
(
    id   INT     NOT NULL AUTO_INCREMENT, 
    publisher VARCHAR(50), 
    title  VARCHAR(50)   NOT NULL, 
    status  ENUM('active', 'announced', 'inactive'), 
    discount TINYINT    NOT NULL, 
    CONSTRAINT title_pk PRIMARY KEY (id), 
    CONSTRAINT title_fk FOREIGN KEY (publisher) 
     REFERENCES publishers (name) 
     ON DELETE SET NULL 
     ON UPDATE CASCADE 
); 

CREATE TABLE subscriptions 
(
    user  INT, 
    title  INT, 
    quantity TINYINT    DEFAULT 1   NOT NULL, 
    CONSTRAINT subscription_pk PRIMARY KEY (user, title), 
    CONSTRAINT subscription_user_fk FOREIGN KEY (user) 
     REFERENCES users (id) 
     ON DELETE SET NULL 
     ON UPDATE CASCADE, 
    CONSTRAINT subscription_title_fk FOREIGN KEY (title) 
     REFERENCES titles (id) 
     ON DELETE SET NULL 
     ON UPDATE CASCADE 
); 

Answer 1

使用表定義，只有subscriptions表給出了一個問題，這是因爲ON DELETE SET NULL子句。 subscriptions表中的user和title列定義爲NOT NULL！

Answer 2

主鍵被定義爲錯誤。 constraint title_pk primary key (id)和那些都是錯誤的。他們應該像primary key(id)

Answer 3

它可能會失敗的外鍵約束。

運行以下命令：

SHOW ENGINE INNODB STATUS\G 

，並期待 「國外最新鍵錯誤」 一節。這應該告訴你這個問題。

如果還不存在的用戶和/或標題表，應在創建表之前運行此：

set foreign_key_checks = 0; 

如果不存在這些表，它可能是數據類型不匹配在父列（即user.id）和子列（即用戶）之間。