I'm trying to make the database system point of sale, however I am confused between the entity and product inventory entity. What are the differences between product and inventory? 

I know that the inventory should control the amount of product available .... but i have all that in products. 

```
product code 
name 
description 
cost 
unit price 
Subcategory code 
brand code 
amount available 
Minimum quantity for rehearing 
state 
tax code 
weight 
amount wholesales 
wholesales price 
perishable 
due date 
creation date 
upgrade date

```

what i should have in inventory? I have researched and according to what I read I need to have the product, the description, the quantity, purchase price, sale price, profit or gain and date of the transactions. But almost everything is in the Products table, what should I do?