@r2schools hey I enjoyed your video which u have given me link I am build an e-commerce website so I have to store different data like product that customer buyed ,seller product data and customer login data. So I have to make 3 table to store the data but how can I make sure that product that customer buyed data is stored in table no. 1 at KZbin I have seen that everyone shows only 1 data stored in 1 table but what if we have to stored 2 data in 2 table how did database know it should we have to mention it in frontend code??