solution1

task.sql

@@ -1,33 +1,51 @@
--- Create database and tables
+DROP DATABASE IF EXISTS ShopDB; 
 
 CREATE DATABASE ShopDB;
+
+
 USE ShopDB;
 
-CREATE TABLE Countries (
-    ID INT,
-    Name VARCHAR(50),
-    PRIMARY KEY (ID)
+
+Create Table Countries (
+    ID INT AUTO_INCREMENT,
+    PRIMARY KEY (ID),
+    NAME VARCHAR(50)
 );
 
-CREATE TABLE ProductInventory (
-    ID INT,
-    ProductName VARCHAR(50),
-    WarehouseAmount INT,
+CREATE TABLE Warehouses (
+    ID INT AUTO_INCREMENT,
+    PRIMARY KEY (ID),
     WarehouseName VARCHAR(50),
-    WarehouseAddress VARCHAR(50), 
+    WarehouseAddress VARCHAR(50),
     CountryID INT,
-	FOREIGN KEY (CountryID) REFERENCES Countries(ID) ON DELETE NO ACTION,
-    PRIMARY KEY (ID)
+    FOREIGN KEY (CountryID) REFERENCES Countries(ID) ON DELETE NO ACTION
 );
 
--- Populate test data
-
-INSERT INTO Countries (ID,Name)
-	VALUES (1, 'Country1');
-INSERT INTO Countries (ID,Name)
-	VALUES (2, 'Country2');
-
-INSERT INTO ProductInventory (ID,ProductName,WarehouseAmount,WarehouseName,WarehouseAddress,CountryID)
-	VALUES (1, 'AwersomeProduct', 2, 'Warehouse-1', 'City-1, Street-1',1);
-INSERT INTO ProductInventory (ID,ProductName,WarehouseAmount,WarehouseName,WarehouseAddress,CountryID)
-	VALUES (2, 'AwersomeProduct', 5, 'Warehouse-2', 'City-2, Street-2',2);
+CREATE TABLE Product (
+    ID INT AUTO_INCREMENT,
+    PRIMARY KEY (ID),
+    Name VARCHAR(50)
+);
+CREATE TABLE ProductInventory (
+    ID INT AUTO_INCREMENT,
+    PRIMARY KEY (ID),
+    Amount INT,
+    WarehouseID INT,
+    FOREIGN KEY (WarehouseID) REFERENCES Warehouses(ID) ON DELETE NO ACTION,
+    ProductId INT,
+    FOREIGN KEY (ProductId) REFERENCES Product(ID) ON DELETE CASCADE
+);
+
+
+INSERT INTO Countries (NAME)
+    VALUES ('Country1'), ('Country2');
+
+
+INSERT INTO Warehouses (WarehouseName, WarehouseAddress, CountryID)
+    VALUES ('Warehouse-1', 'City-1, Street-1', 1), ('Warehouse-2', 'City-2, Street-1', 2);
+
+INSERT INTO Product (Name)
+    VALUES ('Product-1'), ('Product-2');
+
+INSERT INTO ProductInventory (WarehouseID, ProductID, Amount)
+    VALUES (1, 1, 2), (2, 2, 5);