Question

尝试使用外键创建一些新表但是我被抓住了，这是代码和我收到的错误，我认为它有一些东西用我的外键做什么？

#1064 - You have an error in your SQL syntax;
    check the manual that corresponds to your MySQL server version for the
    right syntax to use near '(`CustomerID`),
    ) ENGINE=InnoDB DEFAULT CHARSET=UTF8 AUTO_INCREMENT=1' at line 10



DROP TABLE IF EXISTS `Customer`;
CREATE TABLE `Customer` (

    `CustomerID`            INT UNSIGNED AUTO_INCREMENT, 
    `Customer_Number`       VARCHAR(100), 
    `Customer_Name`         VARCHAR(100), 
    `Website`               VARCHAR(255), 
    `Logo`                  VARCHAR(100),

    PRIMARY KEY(`CustomerID`)
) ENGINE=InnoDB DEFAULT CHARSET=UTF8 AUTO_INCREMENT=1;


    DROP TABLE IF EXISTS `Reports`;
    CREATE TABLE `Reports` (

        `ReportsID`             INT UNSIGNED AUTO_INCREMENT, 
        `Role`                  VARCHAR(70), 
        `Region`                VARCHAR(70), 
        `Inpection_Type`        VARCHAR(70), 
        `CustomerID`            INT UNSIGNED,
        `Report_Date`           DATE NOT NULL DEFAULT '0000-00-00',
        `Order_Date`            TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
        `Customer_Name`         VARCHAR(100),
        `Customer_Division`     VARCHAR(70),
        `Memo`                  VARCHAR(255),
        `Billing_Key`           VARCHAR(70),

        PRIMARY KEY(`ReportsID`),
        FOREIGN KEY (`CustomerID`) REFERENCES Customer(`CustomerID`) ON DELETE CASCADE ON UPDATE CASCADE
    ) ENGINE=InnoDB DEFAULT CHARSET=UTF8 AUTO_INCREMENT=1;

    DROP TABLE IF EXISTS `CustomerContact`;
    CREATE TABLE `CustomerContact` (

        `ContactID`             INT UNSIGNED AUTO_INCREMENT,
        `CustomerID`            INT UNSIGNED,
        `Division`              VARCHAR(100), 
        `Contact`               VARCHAR(100), 
        `Address`               VARCHAR(255),
        `Phone`                 VARCHAR(100),
        `Fax`                   VARCHAR(100),
        `Email`                 VARCHAR(100),
        `Mobile`                VARCHAR(100),

        PRIMARY KEY(`ContactID`),
        FOREIGN KEY (`CustomerID) REFERENCES Customer(`CustomerID`) ON DELETE CASCADE ON UPDATE CASCADE
    ) ENGINE=InnoDB DEFAULT CHARSET=UTF8 AUTO_INCREMENT=1;

Answer 1

徽标列后面缺少逗号，外键定义中CustomerID列名称末尾缺少反引号。

修复这些并重新运行DDL后，您会发现CustomerContact表没有名为CustomerID的列，所以您也应该添加它。

  DROP TABLE IF EXISTS `Customer`;
    CREATE TABLE `Customer` ( 
        `CustomerID`            INT UNSIGNED AUTO_INCREMENT,
        `Customer_Number`        VARCHAR(100),
        `Customer_Name`            VARCHAR(100),
        `Website`                VARCHAR(255),
        `Logo`                    VARCHAR(100),
        PRIMARY KEY(`CustomerID`)
    ) ENGINE=InnoDB DEFAULT CHARSET=UTF8 AUTO_INCREMENT=1;


    DROP TABLE IF EXISTS `CustomerContact`;
    CREATE TABLE `CustomerContact` (

        `ContactID`                INT UNSIGNED AUTO_INCREMENT,
        `Division`                VARCHAR(100),
        `Contact`                VARCHAR(100),
        `Address`                VARCHAR(255),
        `Phone`                    VARCHAR(100),
        `Fax`                    VARCHAR(100),
        `Email`                    VARCHAR(100),
        `Mobile`                VARCHAR(100),
        PRIMARY KEY(`ContactID`),
        CONSTRAINT FOREIGN KEY (`CustomerID`) REFERENCES Customer(`CustomerID`) ON DELETE CASCADE ON UPDATE CASCADE
    ) ENGINE=InnoDB DEFAULT CHARSET=UTF8 AUTO_INCREMENT=1;

Answer 2

你错过了一个逗号：

    `Logo`                    VARCHAR(100),
    PRIMARY KEY(`CustomerID`)

等

最后还有一个回拨：

    CONSTRAINT FOREIGN KEY (`CustomerID`) REFERENCES Customer(`CustomerID`) ON DELETE CASCADE ON UPDATE CASCADE

MYSQL使用外键创建表生成错误

2 个答案: