MySQL數據庫「創建表」查詢

CREATE TABLE `test`.`friendlist` (
    `Lid` INT NOT NULL, 
    `Pid` INT NOT NULL, 
    `Fid` INT NOT NULL AUTO_INCREMENT, 
    PRIMARY KEY (`Fid`), 
    INDEX `Pid_idx` (`Pid` ASC), 
    INDEX `Lid_idx` (`Lid` ASC, `Pid` ASC), 
    CONSTRAINT `Lid` 
    FOREIGN KEY (`Lid` , `Pid`) 
    REFERENCES `test`.`loginauthentication` (`Lid` , `Pid`) 
    ON DELETE NO ACTION 
    ON UPDATE NO ACTION, 
    CONSTRAINT `Pid` 
    FOREIGN KEY (`Pid`) 
    REFERENCES `test`.`person` (`Pid`) 
    ON DELETE NO ACTION 
    ON UPDATE NO ACTION);

操作失敗：將SQL腳本應用到數據庫時發生錯誤。錯誤1215：無法添加外鍵約束 SQL語句：MySQL數據庫「創建表」查詢

來源

2015-11-19 user3334346

請問您可以發佈引用表的定義嗎？也許他們的某個PK的數據類型與你的FK的數據類型不匹配。 – cproinger

您是否嘗試搜尋該錯誤訊息？谷歌搜索'mysql錯誤1215'帶來了幾個SE頁面，有人遇到了這個確切的錯誤。 –

我嘗試執行SQL和我FO und that列Pid dosent存在於表登錄身份驗證，但我添加了列並再次運行您的SQL，它工作！

ALTER TABLE `loginauthentication`ADD COLUMN `Pid` int(11) NULL AFTER `Lid` 

[SQL] CREATE TABLE `friendlist` (
    `Lid` INT NOT NULL, 
    `Pid` INT NOT NULL, 
    `Fid` INT NOT NULL AUTO_INCREMENT, 
    PRIMARY KEY (`Fid`), 
    INDEX `Pid_idx` (`Pid` ASC), 
    INDEX `Lid_idx` (`Lid` ASC, `Pid` ASC), 
    CONSTRAINT `Lid` 
    FOREIGN KEY (`Lid` , `Pid`) 
    REFERENCES `loginauthentication` (`Lid` , `Pid`) 
    ON DELETE NO ACTION 
    ON UPDATE NO ACTION, 
    CONSTRAINT `Pid` 
    FOREIGN KEY (`Pid`) 
    REFERENCES `person` (`Pid`) 
    ON DELETE NO ACTION 
    ON UPDATE NO ACTION); 
Affected rows: 0 
Time: 0.179ms

Grettings！

來源

2015-11-20 15:00:06

-1

運行此DDL第一：

set foreign_key_checks=0;

然後做查詢

CREATE TABLE test.friendlist ( 
Lid INT NOT NULL, 
    Pid INT NOT NULL, 
    Fid INT NOT NULL AUTO_INCREMENT PRIMARY KEY , 
INDEX Pid_idx (Pid ASC), 
INDEX Lid_idx (Lid ASC, Pid ASC), 
CONSTRAINT Lid FOREIGN KEY (Lid , Pid) REFERENCES test.loginauthentication (Lid , Pid) ON DELETE NO ACTION ON UPDATE NO ACTION, 
CONSTRAINT Pid FOREIGN KEY (Pid) REFERENCES test.person (Pid) ON DELETE NO ACTION ON UPDATE NO ACTION);

EX：用我自己的參考表進行相應的修改

mysql> show create table friendlistl 

| friendlist | CREATE TABLE `friendlist` (
    `Lid` int(11) NOT NULL, 
    `Pid` int(11) NOT NULL, 
    `Fid` int(11) NOT NULL AUTO_INCREMENT, 
    PRIMARY KEY (`Fid`), 
    KEY `Pid_idx` (`Pid`), 
    KEY `Lid_idx` (`Lid`,`Pid`), 
    CONSTRAINT `Lid` FOREIGN KEY (`Lid`, `Pid`) REFERENCES `test` (`Lid`, `Pid`) ON DELETE NO ACTION ON UPDATE NO ACTION, 
    CONSTRAINT `Pid` FOREIGN KEY (`Pid`) REFERENCES `test` (`idn`) ON DELETE NO ACTION ON UPDATE NO ACTION 
) ENGINE=InnoDB DEFAULT CHARSET=latin1 |

來源

2015-11-19 21:13:33 HashSu

如果你打算把他們全部關閉並將桌子切入桌面，有什麼限制？可怕。 –

MySQL數據庫「創建表」查詢

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