From a859c5b219f4d9553544d6462dcfb58cf6b771ec Mon Sep 17 00:00:00 2001
From: KostiukOleksandr <Sanjan101088@gmail.com>
Date: Sat, 16 May 2026 21:49:19 +0300
Subject: [PATCH] Database Normalization

---
 task.sql | 56 ++++++++++++++++++++++++++++++++++++--------------------
 1 file changed, 36 insertions(+), 20 deletions(-)

diff --git a/task.sql b/task.sql
index cc65344..942134d 100644
--- a/task.sql
+++ b/task.sql
@@ -1,5 +1,3 @@
--- Create database and tables
-
 CREATE DATABASE ShopDB;
 USE ShopDB;
 
@@ -9,25 +7,43 @@ CREATE TABLE Countries (
     PRIMARY KEY (ID)
 );
 
-CREATE TABLE ProductInventory (
-    ID INT,
-    ProductName VARCHAR(50),
-    WarehouseAmount INT,
+CREATE TABLE Products (
+    ProductID INT PRIMARY KEY,
+    ProductName VARCHAR(50)
+);
+
+CREATE TABLE Warehouses (
+    ID INT PRIMARY KEY,
     WarehouseName VARCHAR(50),
-    WarehouseAddress VARCHAR(50), 
+    WarehouseAddress VARCHAR(100),
     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
+CREATE TABLE ProductInventory (
+    ID INT PRIMARY KEY,
+    ProductID INT,
+    WarehouseID INT,
+    WarehouseAmount INT,
+    FOREIGN KEY (ProductID) REFERENCES Products(ProductID)
+    ON DELETE NO ACTION,
+    FOREIGN KEY (WarehouseID) REFERENCES Warehouses(ID)
+    ON DELETE NO ACTION
+);
 
-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);
+-- Країни
+INSERT INTO Countries (ID, Name)
+VALUES (1, 'Country1'), (2, 'Country2');
+-- Спочатку товари
+INSERT INTO Products (ProductID, ProductName)
+VALUES (1, 'AwersomeProduct');
+-- Склади
+INSERT INTO Warehouses (ID, WarehouseName, WarehouseAddress, CountryID)
+VALUES (1, 'Warehouse-1', 'City-1, Street-1', 1);
+INSERT INTO Warehouses (ID, WarehouseName, WarehouseAddress, CountryID)
+VALUES (2, 'Warehouse-2', 'City-2, Street-2', 2);
+-- Потім інвентар (посилання на товар та склад)
+INSERT INTO ProductInventory (ID, ProductID, WarehouseID, WarehouseAmount)
+VALUES (1, 1, 1, 2);
+INSERT INTO ProductInventory (ID, ProductID, WarehouseID, WarehouseAmount)
+VALUES (2, 1, 2, 5);