Solution

task.sql

@@ -9,25 +9,45 @@ CREATE TABLE Countries (
     PRIMARY KEY (ID)
 );
 
-CREATE TABLE ProductInventory (
-    ID INT,
+CREATE TABLE Products (
+	ID INT AUTO_INCREMENT,
     ProductName VARCHAR(50),
-    WarehouseAmount INT,
+    PRIMARY KEY(ID)
+);
+
+CREATE TABLE Warehouse (
+	ID INT AUTO_INCREMENT,
     WarehouseName VARCHAR(50),
-    WarehouseAddress VARCHAR(50), 
     CountryID INT,
 	FOREIGN KEY (CountryID) REFERENCES Countries(ID) ON DELETE NO ACTION,
+    WarehouseAddress VARCHAR(50),
+    PRIMARY KEY(ID)
+);
+
+CREATE TABLE ProductInventory (
+    ID INT,
+    ProductID INT,
+    WarehouseID INT,
+    WarehouseAmount INT,
+    FOREIGN KEY (ProductID) REFERENCES Products(ID) ON DELETE NO ACTION,
+    FOREIGN KEY (WarehouseID) REFERENCES Warehouse (ID) ON DELETE NO ACTION,
     PRIMARY KEY (ID)
 );
 
 -- 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 Warehouse (ID, WarehouseName, CountryID, WarehouseAddress)
+				VALUES (1, "Warehouse1", 1, "WarehouseAddress1"),
+				        (2, "Warehouse2", 2, "WarehouseAddress2");
+
+INSERT INTO Products (ID, ProductName)
+				VALUES (1, "ProductName1"),
+				        (2, "ProductName2");
+
+INSERT INTO ProductInventory (ID, ProductID, WarehouseID, WarehouseAmount)
+	            VALUES (1, 1, 1, 11),
+	                    (2, 2, 2, 22);