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CREATE TABLE Customers ( CustomerID INT PRIMARY KEY, CustomerName VARCHAR(100) NOT NULL ); CREATE TABLE Orders ( OrderID INT PRIMARY KEY, OrderDate DATE, CustomerID INT, FOREIGN KEY (CustomerID) REFERENCES Customers(CustomerID) ); INSERT INTO Customers (CustomerID, CustomerName) VALUES (1, 'John Doe'); INSERT INTO Orders (OrderID, OrderDate, CustomerID) VALUES (101, '2025-04-01', 1); UPDATE Orders SET CustomerID = 1 WHERE OrderID = 101; ALTER TABLE Orders DROP CONSTRAINT Orders_ibfk_1; ALTER TABLE Orders ADD CONSTRAINT fk_customer FOREIGN KEY (CustomerID) REFERENCES Customers(CustomerID) ON DELETE CASCADE; DELETE FROM Customers WHERE CustomerID = 1;

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