无法更新或删除父行
问题描述 投票：0回答：1
CREATE DATABASE BOOKMANAGEMENTSYSTEM;
USE BOOKMANAGEMENTSYSTEM;
CREATE TABLE Employee (
emp_id INT PRIMARY KEY,
emp_name VARCHAR(20),
emp_role VARCHAR(30)
);
CREATE TABLE Customer (
cust_id INT PRIMARY KEY,
cust_name VARCHAR(20),
cust_add VARCHAR(30)
);
CREATE TABLE Supplier (
supp_id INT PRIMARY KEY,
supp_name VARCHAR(20),
supp_contact VARCHAR(40)
);
CREATE TABLE Book (
book_id INT,
book_price DECIMAL(10, 2),
genre VARCHAR(25),
book_name VARCHAR(20),
PRIMARY KEY (book_id)
);
CREATE TABLE Inventory (
inventory_id INT,
category VARCHAR(20),
selling_price DECIMAL(10, 2),
PRIMARY KEY (inventory_id)
);
CREATE TABLE Invoice (
invoice_id INT,
supp_id INT,
book_id INT,
inventory_id INT,
PRIMARY KEY (invoice_id)
);
CREATE TABLE Payment (
pay_id INT,
item_qty INT,
Tprice DECIMAL (10,2),
order_id INT,
PRIMARY KEY (pay_id)
);
CREATE TABLE Orders (
order_id INT,
order_qty INT,
date DATE,
inventory_id INT,
book_id INT,
cust_id INT,
emp_id INT,
PRIMARY KEY (order_id)
);
ALTER TABLE Invoice
ADD CONSTRAINT FK_Invoice_Book FOREIGN KEY (book_id) REFERENCES Book (book_id),
ADD CONSTRAINT FK_Invoice_Supplier FOREIGN KEY (supp_id) REFERENCES Supplier (supp_id),
ADD CONSTRAINT FK_Invoice_Inventory FOREIGN KEY (inventory_id) REFERENCES Inventory (inventory_id);
ALTER TABLE Payment
ADD CONSTRAINT FK_Payment_Orders FOREIGN KEY (order_id)
REFERENCES Orders (order_id);
ALTER TABLE Orders
ADD CONSTRAINT FK_Orders_Inventory FOREIGN KEY (inventory_id) REFERENCES Inventory (inventory_id),
ADD CONSTRAINT FK_Orders_Book FOREIGN KEY (book_id) REFERENCES Book (book_id),
ADD CONSTRAINT FK_Orders_Customer FOREIGN KEY (cust_id) REFERENCES Customer (cust_id),
ADD CONSTRAINT FK_Orders_Employee FOREIGN KEY (emp_id) REFERENCES Employee (emp_id);
INSERT INTO Employee (emp_id, emp_name, emp_role)
VALUES ('101', 'Amirul', 'Cashier'),
('102', 'Nurin', 'Store Manager'),
('103', 'Diana', 'Admin'),
('104', 'Faris', 'Inventory Manager'),
('105', 'Christy', 'Sales Coordinator');
INSERT INTO Customer (cust_id, cust_name, cust_add)
VALUES ('201', 'Nuria', 'Taman Mawar, 88400'),
('202', 'Stephan', 'Taman Lily, 88400'),
('203', 'Khairul', 'Taman Kemboja, 88400'),
('204', 'Maria', 'Taman Tulip, 88400'),
('205', 'Rina', 'Taman Bunga Raya, 88400');
INSERT INTO Supplier (supp_id, supp_name, supp_contact)
VALUES ('301', 'Scholastic', '[email protected]'),
('302', 'Karya Seni', '[email protected]'),
('303', 'Simon & Schuster', '[email protected]'),
('304', 'Bloomsbury', '[email protected]'),
('305', 'HarperVia', '[email protected]');
INSERT INTO Book (book_id, book_price, genre, book_name)
VALUES ('401', '25.50', 'young adult', 'Thea Stilton'),
('402', '20.20', 'drama', 'Twisted fate'),
('403', '32.70', 'comedy', 'Dork diaries'),
('404', '45.60', 'fantasy', 'Harry Potter'),
('405', '27.00', 'non-fiction', 'Almond');
INSERT INTO Inventory (inventory_id, category, selling_price)
VALUES ('501', 'young adult fiction', '28.50'), ('502', 'adult fiction', '25.20'),
('503', 'young adult fiction', '35.70'),
('504', 'adult fiction', '50.60'),
('505', 'adult non-fiction', '30.00');
INSERT INTO Invoice (invoice_id, supp_id, book_id, inventory_id)
VALUES ('00001', '301', '401', '501'),
('00002', '302', '402', '502'),
('00003', '303', '403', '503'),
('00004', '304', '404', '504'),
('00005', '305', '405', '505');
INSERT INTO Orders (order_id, order_qty, date, inventory_id, book_id, cust_id, emp_id)
VALUES ('10001', '1', '2024-01-11', '501', '401', '201', '101'),
('10002', '2', '2024-01-12', '502', '402', '202', '102'),
('10003', '1', '2024-01-13', '503', '403', '203', '103'),
('10004', '2', '2024-01-14', '504', '404', '204', '104'),
('10005', '1', '2024-01-15', '505', '405', '205', '105');
INSERT INTO Payment (pay_id, item_qty, Tprice, order_id)
VALUES ('20001', '1', '28.50', '10001'),
('20002', '2', '50.40', '10002'),
('20003', '1', '35.70', '10003'),
('20004', '2', '101.20', '10004'),
('20005', '1', '30.00', '10005');
DELETE FROM Employee WHERE emp_id = 103;
DELETE FROM Employee WHERE emp_id = 105;
UPDATE Employee SET emp_role = 'Sales Coordinator' WHERE emp_id = 101;
UPDATE Employee SET emp_role = 'Admin' WHERE emp_id = 104;
UPDATE Employee SET emp_role = 'Inventory Manager' WHERE emp_id = 102;
我尝试删除和更新员工表中的项目，但显示以下错误。无法删除或更新父行：外键约束失败 (
bookmanagementsystemordersFK_Orders_Employeeemp_idEmployeeemp_id1个回答
0
投票
投票
我解决你的问题。
添加外键时需要添加
ON DELETE CASCADEALTER TABLE Payment
ADD CONSTRAINT FK_Payment_Orders FOREIGN KEY (order_id)
REFERENCES Orders (order_id) ON DELETE CASCADE;
记住ON DELETE CASCADE用于指定当从父表中删除一行时，子表中引用已删除行的所有行也应被删除
解决方案已添加到您的查询中：
CREATE DATABASE BOOKMANAGEMENTSYSTEM;
USE BOOKMANAGEMENTSYSTEM;
CREATE TABLE Employee (
emp_id INT PRIMARY KEY,
emp_name VARCHAR(20),
emp_role VARCHAR(30)
);
CREATE TABLE Customer (
cust_id INT PRIMARY KEY,
cust_name VARCHAR(20),
cust_add VARCHAR(30)
);
CREATE TABLE Supplier (
supp_id INT PRIMARY KEY,
supp_name VARCHAR(20),
supp_contact VARCHAR(40)
);
CREATE TABLE Book (
book_id INT,
book_price DECIMAL(10, 2),
genre VARCHAR(25),
book_name VARCHAR(20),
PRIMARY KEY (book_id)
);
CREATE TABLE Inventory (
inventory_id INT,
category VARCHAR(20),
selling_price DECIMAL(10, 2),
PRIMARY KEY (inventory_id)
);
CREATE TABLE Invoice (
invoice_id INT,
supp_id INT,
book_id INT,
inventory_id INT,
PRIMARY KEY (invoice_id)
);
CREATE TABLE Payment (
pay_id INT,
item_qty INT,
Tprice DECIMAL (10,2),
order_id INT,
PRIMARY KEY (pay_id)
);
CREATE TABLE Orders (
order_id INT,
order_qty INT,
date DATE,
inventory_id INT,
book_id INT,
cust_id INT,
emp_id INT,
PRIMARY KEY (order_id)
);
ALTER TABLE Invoice
ADD CONSTRAINT FK_Invoice_Book FOREIGN KEY (book_id) REFERENCES Book (book_id),
ADD CONSTRAINT FK_Invoice_Supplier FOREIGN KEY (supp_id) REFERENCES Supplier (supp_id),
ADD CONSTRAINT FK_Invoice_Inventory FOREIGN KEY (inventory_id) REFERENCES Inventory (inventory_id);
ALTER TABLE Payment
ADD CONSTRAINT FK_Payment_Orders FOREIGN KEY (order_id)
REFERENCES Orders (order_id) ON DELETE CASCADE;
ALTER TABLE Orders
ADD CONSTRAINT FK_Orders_Inventory FOREIGN KEY (inventory_id) REFERENCES Inventory (inventory_id),
ADD CONSTRAINT FK_Orders_Book FOREIGN KEY (book_id) REFERENCES Book (book_id),
ADD CONSTRAINT FK_Orders_Customer FOREIGN KEY (cust_id) REFERENCES Customer (cust_id),
ADD CONSTRAINT FK_Orders_Employee FOREIGN KEY (emp_id) REFERENCES Employee (emp_id) ON DELETE CASCADE;
INSERT INTO Employee (emp_id, emp_name, emp_role)
VALUES ('101', 'Amirul', 'Cashier'),
('102', 'Nurin', 'Store Manager'),
('103', 'Diana', 'Admin'),
('104', 'Faris', 'Inventory Manager'),
('105', 'Christy', 'Sales Coordinator');
INSERT INTO Customer (cust_id, cust_name, cust_add)
VALUES ('201', 'Nuria', 'Taman Mawar, 88400'),
('202', 'Stephan', 'Taman Lily, 88400'),
('203', 'Khairul', 'Taman Kemboja, 88400'),
('204', 'Maria', 'Taman Tulip, 88400'),
('205', 'Rina', 'Taman Bunga Raya, 88400');
INSERT INTO Supplier (supp_id, supp_name, supp_contact)
VALUES ('301', 'Scholastic', '[email protected]'),
('302', 'Karya Seni', '[email protected]'),
('303', 'Simon & Schuster', '[email protected]'),
('304', 'Bloomsbury', '[email protected]'),
('305', 'HarperVia', '[email protected]');
INSERT INTO Book (book_id, book_price, genre, book_name)
VALUES ('401', '25.50', 'young adult', 'Thea Stilton'),
('402', '20.20', 'drama', 'Twisted fate'),
('403', '32.70', 'comedy', 'Dork diaries'),
('404', '45.60', 'fantasy', 'Harry Potter'),
('405', '27.00', 'non-fiction', 'Almond');
INSERT INTO Inventory (inventory_id, category, selling_price)
VALUES ('501', 'young adult fiction', '28.50'), ('502', 'adult fiction', '25.20'),
('503', 'young adult fiction', '35.70'),
('504', 'adult fiction', '50.60'),
('505', 'adult non-fiction', '30.00');
INSERT INTO Invoice (invoice_id, supp_id, book_id, inventory_id)
VALUES ('00001', '301', '401', '501'),
('00002', '302', '402', '502'),
('00003', '303', '403', '503'),
('00004', '304', '404', '504'),
('00005', '305', '405', '505');
INSERT INTO Orders (order_id, order_qty, date, inventory_id, book_id, cust_id, emp_id)
VALUES ('10001', '1', '2024-01-11', '501', '401', '201', '101'),
('10002', '2', '2024-01-12', '502', '402', '202', '102'),
('10003', '1', '2024-01-13', '503', '403', '203', '103'),
('10004', '2', '2024-01-14', '504', '404', '204', '104'),
('10005', '1', '2024-01-15', '505', '405', '205', '105');
INSERT INTO Payment (pay_id, item_qty, Tprice, order_id)
VALUES ('20001', '1', '28.50', '10001'),
('20002', '2', '50.40', '10002'),
('20003', '1', '35.70', '10003'),
('20004', '2', '101.20', '10004'),
('20005', '1', '30.00', '10005');
DELETE FROM Employee WHERE emp_id = 103;
DELETE FROM Employee WHERE emp_id = 105;
UPDATE Employee SET emp_role = 'Sales Coordinator' WHERE emp_id = 101;
UPDATE Employee SET emp_role = 'Admin' WHERE emp_id = 104;
UPDATE Employee SET emp_role = 'Inventory Manager' WHERE emp_id = 102;
查询结果：
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