Creating a Trigger and some Database Design

Question

Here is the scenario, we have the following tables
Orders, OrderDetails, Products, ProductsToInventory, Inventory, and InventoryDetails
Orders is where the orders are saved and their details are in OrderDetails (orderdetails has a column called Type and that type can either be a product, inventory, shipping, fee, so that we can distinguish what each one is in the order)
Products are the products we sell and ProductsToInventory refers each product to the inventory items required for it.
Inventory lists the the name, size, and weight of the item
then InventoryDetails stores the cost, original quantity received, and the current quantity (since the company receives different quantities of the same product at different pricing all the time)  (I would appreciate all the comments on this, this is
the best way I thought of doing this but if you have another way i'd appreciate it)
So that's the design, now we created a trigger that basically does this...
When an order is created and a PRODUCT is inserted into the the orderdetails, we will, using trigger, run the following query to insert the INVENTORY into the orderdetails
   INSERT INTO OrderDetails (...., OrderDetailPrice)
   SELECT ..., OrderDetailPrice?
    FROM inserted i INNER JOIN ProductToInventories pt
    ON i.productid = pt.id
    INNER JOIN Inventories inv
    ON pt.InventoryID = inv.InventoryID
    LEFT JOIN InventoryDetails idet
    ON inv.InventoryID = idet.InventoryDetailInventoryID
    WHERE OrderDetailType = "PRODUCT"
This works perfectly fine, however... for the price, we don't know what to do here, since the price is not in the inventory, the price is  under the inventorydetails and we will have to look up to that table to see which one has quantity > the quantity
needed here and then grab the price for that and then we need to update the quantity on that as well.

Answer 1

Here is the scenario, we have the following tables
Orders, OrderDetails, Products, ProductsToInventory, Inventory, and InventoryDetails
Orders is where .....
Good day TheSQLNewb,
I did not read more than I quote above... This is a starting of a nice story :-) but in the forum and in DBA's life we prefer to get DDL+DML instead of stories.
Please post queries to create the relevant tables (this is DDL by the way), and queries to insert some sample data (DML). with this information we will be able to reproduce the tables in our server and work on them.
Thanks :-)
  Ronen Ariely
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