'Solution'

task.sql

@@ -2,10 +2,58 @@
 USE ShopDB; 
 
 -- Some data should be created outside the transaction (here)
+DROP DATABASE ShopDB;
+CREATE DATABASE ShopDB;
+USE ShopDB;
 
+CREATE TABLE Products (
+    ID INT AUTO_INCREMENT,
+    Name VARCHAR(50),
+    Description VARCHAR(100),
+    Price INT,
+    WarehouseAmount INT,
+    PRIMARY KEY (ID)
+);
+
+CREATE TABLE Customers (
+    ID INT AUTO_INCREMENT,
+    FirstName VARCHAR(50),
+    LastName VARCHAR(50),
+    Email VARCHAR(50),
+    Address VARCHAR(50),
+    PRIMARY KEY (ID)
+);
+
+CREATE TABLE Orders (
+    ID INT AUTO_INCREMENT,
+    CustomerID INT, 
+    FOREIGN KEY (CustomerID) REFERENCES Customers(ID) ON DELETE SET NULL,
+    Date DATE,
+    PRIMARY KEY (ID)
+);
+
+CREATE TABLE OrderItems (
+    ID INT AUTO_INCREMENT,
+    OrderID INT, 
+    FOREIGN KEY (OrderID) REFERENCES Orders(ID) ON DELETE SET NULL,
+	ProductID INT, 
+    Count INT,
+    FOREIGN KEY (ProductID) REFERENCES Products(ID) ON DELETE SET NULL,
+    PRIMARY KEY (ID)
+);
+
+INSERT INTO Products (Name, Description, Price, WarehouseAmount)
+	VALUES ('AwersomeProduct', 'Product Desctiption', 5, 42);
+
+INSERT INTO Customers (FirstName, LastName, Email, Address)
+	VALUES ('John', 'Dou', 'j@dou.ua', 'far, far away');
+
+INSERT INTO Orders (CustomerID, Date) VALUES (1, '2023-01-01');
 -- Start the transaction 
 START TRANSACTION; 
 
--- And some data should be created inside the transaction 
+INSERT INTO OrderItems (OrderID, ProductID, Count) 
+VALUES (LAST_INSERT_ID(), 1, 1);
+UPDATE Products SET WarehouseAmount = WarehouseAmount - 1 WHERE ID = 1;
 
 COMMIT;