Modelling price, discounts and inventory in a schema












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I am making a database for a store with inventory and discounts (study project), and I'm having problems with a few situations.
er schema




  • A discount can be for a category or a specific product. That's two different types with a same variable - ratio. Would it be possible to somehow abstract them both into a single entity?

  • Where should the discount (price modifier) connect to? Should it point to the price, or only to the "sold product" entity?

  • How exactly should the product attributes change in the application? Do I update the price and the inventory tables when I sell a product, or do I leave it as it is and figure out the changes based on "sold product" table history?









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    I am making a database for a store with inventory and discounts (study project), and I'm having problems with a few situations.
    er schema




    • A discount can be for a category or a specific product. That's two different types with a same variable - ratio. Would it be possible to somehow abstract them both into a single entity?

    • Where should the discount (price modifier) connect to? Should it point to the price, or only to the "sold product" entity?

    • How exactly should the product attributes change in the application? Do I update the price and the inventory tables when I sell a product, or do I leave it as it is and figure out the changes based on "sold product" table history?









    share







    New contributor




    user174176 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
    Check out our Code of Conduct.























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      I am making a database for a store with inventory and discounts (study project), and I'm having problems with a few situations.
      er schema




      • A discount can be for a category or a specific product. That's two different types with a same variable - ratio. Would it be possible to somehow abstract them both into a single entity?

      • Where should the discount (price modifier) connect to? Should it point to the price, or only to the "sold product" entity?

      • How exactly should the product attributes change in the application? Do I update the price and the inventory tables when I sell a product, or do I leave it as it is and figure out the changes based on "sold product" table history?









      share







      New contributor




      user174176 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.












      I am making a database for a store with inventory and discounts (study project), and I'm having problems with a few situations.
      er schema




      • A discount can be for a category or a specific product. That's two different types with a same variable - ratio. Would it be possible to somehow abstract them both into a single entity?

      • Where should the discount (price modifier) connect to? Should it point to the price, or only to the "sold product" entity?

      • How exactly should the product attributes change in the application? Do I update the price and the inventory tables when I sell a product, or do I leave it as it is and figure out the changes based on "sold product" table history?







      schema





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      user174176 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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