diff --git a/SQL_code/Schema.sql b/SQL_code/Schema.sql
index 97b93c4..b63a22f 100644
--- a/SQL_code/Schema.sql
+++ b/SQL_code/Schema.sql
@@ -1,3 +1,7 @@
+-- MySql Version 9.2.0
+CREATE DATABASE Marketplace;
+
+Use Marketplace
 -- User Entity
 CREATE TABLE User (
     UserID INT AUTO_INCREMENT PRIMARY KEY,
@@ -32,6 +36,7 @@ CREATE TABLE Product (
     UserID INT,
     Description TEXT,
     CategoryID INT NOT NULL,
+    Date DATETIME DEFAULT CURRENT_TIMESTAMP,
     FOREIGN KEY (UserID) REFERENCES User (UserID),
     FOREIGN KEY (CategoryID) REFERENCES Category (CategoryID)
 );
@@ -40,8 +45,6 @@ CREATE TABLE Image_URL (
     URL VARCHAR(255),
     FOREIGN KEY (ProductID) REFERENCES Product (ProductID)
 )
-
-
 -- Review Entity (Many-to-One with User, Many-to-One with Product)
 CREATE TABLE Review (
     ReviewID INT PRIMARY KEY,
@@ -113,3 +116,319 @@ CREATE TABLE AuthVerification (
     Authenticated BOOLEAN DEFAULT FALSE,
     Date DATETIME DEFAULT CURRENT_TIMESTAMP
 );
+
+-- Insert sample categories
+INSERT INTO
+    Category (CategoryID, Name)
+VALUES
+    (1, 'Electronics'),
+    (2, 'Clothing'),
+    (3, 'Books'),
+    (4, 'Home & Garden'),
+    (5, 'Sports & Outdoors');
+
+-- USER CRUD OPERATIONS
+-- Create User (INSERT)
+INSERT INTO
+    User (Name, Email, UCID, Password, Phone, Address)
+VALUES
+    (
+        'John Doe',
+        'john@example.com',
+        'UC123456',
+        'hashed_password_here',
+        '555-123-4567',
+        '123 Main St'
+    );
+
+-- Set user role
+INSERT INTO
+    UserRole (UserID, Client, Admin)
+VALUES
+    (LAST_INSERT_ID (), TRUE, FALSE);
+
+-- Read User (SELECT)
+SELECT
+    u.*,
+    ur.Client,
+    ur.Admin
+FROM
+    User u
+    JOIN UserRole ur ON u.UserID = ur.UserID
+WHERE
+    u.UserID = 1;
+
+-- Update User (UPDATE)
+UPDATE User
+SET
+    Name = 'John Smith',
+    Phone = '555-987-6543',
+    Address = '456 Elm St'
+WHERE
+    UserID = 1;
+
+-- Update User Role
+UPDATE UserRole
+SET
+    Admin = TRUE
+WHERE
+    UserID = 1;
+
+-- Delete User (DELETE)
+DELETE FROM User
+WHERE
+    UserID = 1;
+
+-- Note: Cascade will delete related UserRole record
+-- PRODUCT CRUD OPERATIONS
+-- Create Product (INSERT)
+INSERT INTO
+    Product (
+        ProductID,
+        Name,
+        Price,
+        StockQuantity,
+        UserID,
+        Description,
+        CategoryID
+    )
+VALUES
+    (
+        1,
+        'Smartphone',
+        599.99,
+        50,
+        1,
+        'Latest model smartphone with amazing features',
+        1
+    );
+
+-- Add product images
+INSERT INTO
+    Image_URL (URL, ProductID)
+VALUES
+    ('https://example.com/images/smartphone1.jpg', 1),
+    ('https://example.com/images/smartphone2.jpg', 1);
+
+-- Read Product (SELECT)
+SELECT
+    p.*,
+    c.Name as CategoryName,
+    u.Name as SellerName,
+    i.URL as ImageURL
+FROM
+    Product p
+    JOIN Category c ON p.CategoryID = c.CategoryID
+    JOIN User u ON p.UserID = u.UserID
+    LEFT JOIN Image_URL i ON p.ProductID = i.ProductID
+WHERE
+    p.ProductID = 1;
+
+-- Update Product (UPDATE)
+UPDATE Product
+SET
+    Name = 'Premium Smartphone',
+    Price = 649.99,
+    StockQuantity = 45,
+    Description = 'Updated description with new features'
+WHERE
+    ProductID = 1;
+
+-- Delete Product (DELETE)
+DELETE FROM Product
+WHERE
+    ProductID = 1;
+
+-- CATEGORY CRUD OPERATIONS (Admin only for delete)
+-- Create Category (INSERT)
+INSERT INTO
+    Category (CategoryID, Name)
+VALUES
+    (6, 'Toys & Games');
+
+-- Read Category (SELECT)
+SELECT
+    *
+FROM
+    Category
+WHERE
+    CategoryID = 6;
+
+-- Update Category (UPDATE)
+UPDATE Category
+SET
+    Name = 'Toys & Children''s Games'
+WHERE
+    CategoryID = 6;
+
+-- Delete Category (DELETE) - Admin only
+DELETE FROM Category
+WHERE
+    CategoryID = 6;
+
+-- REVIEW OPERATIONS (Create only as specified)
+-- Create Review (INSERT)
+INSERT INTO
+    Review (ReviewID, UserID, ProductID, Comment, Rating)
+VALUES
+    (
+        1,
+        1,
+        1,
+        'Great product, very satisfied with the purchase!',
+        5
+    );
+
+-- TRANSACTION OPERATIONS (Create only as specified)
+-- Create Transaction (INSERT)
+INSERT INTO
+    Transaction (TransactionID, UserID, ProductID, PaymentStatus)
+VALUES
+    (1, 1, 1, 'Completed');
+
+-- HISTORY CRUD OPERATIONS
+-- Create History (INSERT)
+INSERT INTO
+    History (HistoryID, UserID, ProductID)
+VALUES
+    (1, 1, 1);
+
+-- Read History (SELECT)
+SELECT
+    h.*,
+    p.Name as ProductName
+FROM
+    History h
+    JOIN Product p ON h.ProductID = p.ProductID
+WHERE
+    h.UserID = 1
+ORDER BY
+    h.Date DESC;
+
+-- Delete History (DELETE)
+DELETE FROM History
+WHERE
+    HistoryID = 1;
+
+-- FAVORITES CRUD OPERATIONS
+-- Create Favorite (INSERT)
+INSERT INTO
+    Favorites (UserID, ProductID)
+VALUES
+    (1, 1);
+
+-- Read Favorites (SELECT)
+SELECT
+    f.*,
+    p.Name as ProductName,
+    p.Price
+FROM
+    Favorites f
+    JOIN Product p ON f.ProductID = p.ProductID
+WHERE
+    f.UserID = 1;
+
+-- Delete Favorite (DELETE)
+DELETE FROM Favorites
+WHERE
+    FavoriteID = 1;
+
+-- RECOMMENDATION SYSTEM OPERATIONS
+-- Create Recommendation (INSERT)
+INSERT INTO
+    Recommendation (RecommendationID_PK, UserID, RecommendedProductID)
+VALUES
+    (1, 1, 2);
+
+-- Read Recommendations (SELECT)
+SELECT
+    r.*,
+    p.Name as RecommendedProductName,
+    p.Price,
+    p.Description
+FROM
+    Recommendation r
+    JOIN Product p ON r.RecommendedProductID = p.ProductID
+WHERE
+    r.UserID = 1;
+
+-- Update Recommendation (UPDATE)
+UPDATE Recommendation
+SET
+    RecommendedProductID = 3
+WHERE
+    RecommendationID_PK = 1;
+
+-- Delete Recommendation (DELETE)
+DELETE FROM Recommendation
+WHERE
+    RecommendationID_PK = 1;
+
+-- Authentication Operations
+-- Create verification code
+INSERT INTO
+    AuthVerification (Email, VerificationCode)
+VALUES
+    ('new_user@example.com', '123456');
+
+-- Update authentication status
+UPDATE AuthVerification
+SET
+    Authenticated = TRUE
+WHERE
+    Email = 'new_user@example.com'
+    AND VerificationCode = '123456';
+
+-- Complex Queries for Reports and Analysis
+-- Get top-selling products
+SELECT
+    p.ProductID,
+    p.Name,
+    COUNT(t.TransactionID) as SalesCount,
+    SUM(p.Price) as TotalRevenue
+FROM
+    Product p
+    JOIN Transaction t ON p.ProductID = t.ProductID
+WHERE
+    t.PaymentStatus = 'Completed'
+GROUP BY
+    p.ProductID,
+    p.Name
+ORDER BY
+    SalesCount DESC
+LIMIT
+    10;
+
+-- Get highest-rated products
+SELECT
+    p.ProductID,
+    p.Name,
+    AVG(r.Rating) as AverageRating,
+    COUNT(r.ReviewID) as ReviewCount
+FROM
+    Product p
+    JOIN Review r ON p.ProductID = r.ProductID
+GROUP BY
+    p.ProductID,
+    p.Name
+HAVING
+    ReviewCount >= 5
+ORDER BY
+    AverageRating DESC
+LIMIT
+    10;
+
+-- Get user purchase history with product details
+SELECT
+    t.TransactionID,
+    t.Date,
+    p.Name,
+    p.Price,
+    t.PaymentStatus
+FROM
+    Transaction t
+    JOIN Product p ON t.ProductID = p.ProductID
+WHERE
+    t.UserID = 1
+ORDER BY
+    t.Date DESC;