我能够在 business 表中成功插入一行，但不能在 business_contact 表中插入一行。每当我尝试在 business_contact 表中插入一行时，我都会收到以下错误：
#1452 - 无法添加或更新子行：外键约束失败
虽然我尝试插入到 business_contact 表中的行有一个 BusinessID，该 BusinessID 已经存在于 business 表中。
business_contact插入语句失败
INSERT INTO business_contact(BusinessID, BusinessContactTypeID, BusinessContactData) VALUES (1, 1, '0097336031000');
【问题讨论】：
标签： mysql database foreign-keys foreign-key-relationship
您应该在business 和contact_type_lookup 表中检查以下内容：
1. business 表有 BusinessID 值，您尝试将其插入到 business_contact
2.contact_type_lookuptable hasContactTypeIDvalue that you are trying to insert into business_contact
此错误与缺少BusinessID 或缺少ContactTypeID 有关。要验证这一点，请从business 表中选择BusinessID 记录，并从contact_type_lookup 表中选择ContactTypeID。
例如： 如果您正在执行以下查询：
insert into business_contact(BusinessContactID, BusinessID, BusinessContactTypeID, BusinessContactData) values ('1', '2', '3', 'This is the business contact data');
然后，确保以下查询返回有效结果：
select BusinessID from business where BusinessID = 2;
select ContactTypeID from business_contact_type where ContactTypeID = 3;
【讨论】：
algallaf_dev.business_contact，CONSTRAINT fk_BusinessContact_Business FOREIGN KEY (BusinessID) REFERENCES @987654342 @ (BusinessID) ON DELETE NO ACTION ON UPDATE NO ACTION)
desc business; 和 desc business_contact;。如果您有任何索引，也请分享。
INSERT INTO business(BusinessID, BusinessName, BusinessDescription) VALUE (1,"Stackoverflow"," Most Awesome Site in the World!");成功contact_type_lookup表插入INSERT INTO contact_type_lookup(ContactTypeID, ContactTypeDescription) VALUE (1, "Website"); business_contact 表插入失败 INSERT INTO business_contact(BusinessID, BusinessContactTypeID, BusinessContactData) VALUE (1,1,"+973-36031000");