tables updated to third normalization form

task.sql

@@ -1,33 +1,52 @@
 -- Create database and tables
+DROP DATABASE IF EXISTS ShopDB;
 
 CREATE DATABASE ShopDB;
 USE ShopDB;
 
 CREATE TABLE Countries (
-    ID INT,
+    ID INT PRIMARY KEY AUTO_INCREMENT,
     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)
+CREATE TABLE Products (
+    ID INT PRIMARY KEY AUTO_INCREMENT,
+    ProductName VARCHAR(50)
 );
 
--- Populate test data
+CREATE TABLE Warehouses (
+    ID INT PRIMARY KEY AUTO_INCREMENT,
+    WarehouseName VARCHAR(50) NOT NULL,
+    WarehouseAddress VARCHAR(50) NOT NULL,
+    CountryID INT NOT NULL,
+    FOREIGN KEY (CountryID) REFERENCES Countries(ID) ON DELETE NO ACTION
+);
+
+CREATE TABLE Inventory (
+    ID INT PRIMARY KEY AUTO_INCREMENT,
+    ProductID INT NOT NULL,
+    WarehouseID INT NOT NULL,
+    WarehouseAmount INT NOT NULL,
+    FOREIGN KEY (ProductID) REFERENCES Products(ID) ON DELETE CASCADE,
+    FOREIGN KEY (WarehouseID) REFERENCES Warehouses(ID) ON DELETE CASCADE
+);
 
-INSERT INTO Countries (ID,Name)
-	VALUES (1, 'Country1');
-INSERT INTO Countries (ID,Name)
-	VALUES (2, 'Country2');
+INSERT INTO Countries (Name)
+	VALUES ('Country1');
+INSERT INTO Countries (Name)
+	VALUES ('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 Products (ProductName)
+	VALUES ('AwesomeProduct');
+INSERT INTO Products (ProductName)
+	VALUES ('AwesomeProduct2');
+
+INSERT INTO Warehouses (WarehouseName, WarehouseAddress, CountryID)
+	VALUES ('warehouse1', 'city-1, street-1', 1);
+INSERT INTO Warehouses (WarehouseName, WarehouseAddress, CountryID)
+	VALUES ('warehouse2', 'city-2, street-2', 2);
+
+INSERT INTO Inventory (ProductID, WarehouseID, WarehouseAmount)
+	VALUES (1, 1, 2);
+INSERT INTO Inventory (ProductID, WarehouseID, WarehouseAmount)
+	VALUES (2, 2, 3);