mysql错误1072

Question

COMMIT WORK
;
DROP DATABASE IF EXISTS Campaign_Database;
CREATE DATABASE Campaign_Database;
USE Campaign_Database;
DROP TABLE IF EXISTS CONTRIBUTOR
;
DROP TABLE IF EXISTS CAMPAIGN
;
DROP TABLE IF EXISTS PLEDGE
;

CREATE TABLE CONTRIBUTOR
(   CONTRIBUTOR_ID VARCHAR(50) primary key,
    Address char(50) not null,
    City char(50) not null,
    State char(2) not null,
    Zip INTEGER(6) not null,
    Home_Phone char (15)
)ENGINE = InnoDB;
;
CREATE TABLE CAMPAIGN
(   CAMPAIGN_ID VARCHAR(50)  primary key,
    Chair_First_Name char (50) not null,
    Chair_Last_Name char (50) not null,
    Launch_Date char (11) not null,
    End_Date char (11) not null,
    Fundraising_Goal INTEGER NOT NULL
)ENGINE = InnoDB;
;

CREATE table PLEDGE
(
    FOREIGN KEY (CONTRIBUTOR_ID) REFERENCES CONTRIBUTOR (CONTRIBUTOR_ID),
    FOREIGN KEY (CAMPAIGN_ID) REFERENCES CAMPAIGN (CAMPAIGN_ID),
    Date_Pledged char(11) not null primary key,
    Amount INTEGER NOT NULL,
    PAID char(1) not null
    CHECK (PAID in ('Y','N')),
    Payment_Date char(11)
)ENGINE = InnoDB;
;

COMMIT WORK
;

这个当前是我用于决赛任务的mysql编码。 我已经尝试了几种方法，但没有成功地在“承诺”中创建两个外键。表

如果我至少可以知道出了什么问题，我将不胜感激。谢谢。

Answer 1

您需要CONTRIBUTOR_ID表格中的CAMPAIGN_ID，PLEDGE字段。

CREATE table PLEDGE
(
    CONTRIBUTOR_ID VARCHAR(50),
    CAMPAIGN_ID VARCHAR(50),
    FOREIGN KEY (CONTRIBUTOR_ID) REFERENCES CONTRIBUTOR (CONTRIBUTOR_ID),
    FOREIGN KEY (CAMPAIGN_ID) REFERENCES CAMPAIGN (CAMPAIGN_ID),
    Date_Pledged char(11) not null primary key,
    Amount INTEGER NOT NULL,
    PAID char(1) not null
    CHECK (PAID in ('Y','N')),
    Payment_Date char(11)
)ENGINE = InnoDB;
;

在本声明中

FOREIGN KEY (CONTRIBUTOR_ID) REFERENCES CONTRIBUTOR (CONTRIBUTOR_ID),

第一个CONTRIBUTOR_ID是指定义约束的表，第二个是指它所指向的表。