Solution

task.sql

@@ -1,33 +1,55 @@
--- Create database and tables
-
 CREATE DATABASE ShopDB;
 USE ShopDB;
 
 CREATE TABLE Countries (
-    ID INT,
-    Name VARCHAR(50),
-    PRIMARY KEY (ID)
+  ID INT,
+  Name VARCHAR(50),
+
+  PRIMARY KEY (ID)
+);
+
+CREATE TABLE Warehouses (
+  ID INT,
+  Name VARCHAR(50),
+  Address VARCHAR(50),
+  CountryID INT,
+
+  PRIMARY KEY (ID),
+  FOREIGN KEY (CountryID) REFERENCES Countries(ID) ON DELETE NO ACTION
+);
+
+CREATE TABLE Products (
+  ID INT,
+  Name VARCHAR(50),
+
+  PRIMARY KEY (ID)
 );
 
 CREATE TABLE ProductInventory (
-    ID INT,
-    ProductName VARCHAR(50),
-    WarehouseAmount INT,
-    WarehouseName VARCHAR(50),
-    WarehouseAddress VARCHAR(50), 
-    CountryID INT,
-	FOREIGN KEY (CountryID) REFERENCES Countries(ID) ON DELETE NO ACTION,
-    PRIMARY KEY (ID)
+  ID INT,
+  ProductID INT,
+  Amount INT,
+  WarehouseID INT,
+
+  PRIMARY KEY (ID),
+  FOREIGN KEY (ProductID) REFERENCES Products(ID) ON DELETE NO ACTION,
+  FOREIGN KEY (WarehouseID) REFERENCES Warehouses(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);
+INSERT INTO Countries (ID, Name)
+VALUES
+  (1, 'Country1'),
+  (2, 'Country2');
+
+INSERT INTO Warehouses (ID, Name, Address, CountryID)
+VALUES
+  (1, 'Warehouse-1', 'City-1, Street-1', 1),
+  (2, 'Warehouse-2', 'City-2, Street-2', 2);
+
+INSERT INTO Products (ID, Name)
+VALUES (1, 'AwersomeProduct');
+
+INSERT INTO ProductInventory (ID, ProductID, Amount, WarehouseID)
+VALUES
+  (1, 1, 2, 1),
+  (2, 1, 5, 2);