Question

I am trying to come up the tables design that each category have different type of point calculation.

First Example: customer order a ‘Intel CPU Core i7 3770K’ item from CPU category – point will be calculated via (category_point / item_cost)

Second Example: customer order a ‘OCZ SSD’ item from a SSD category – point will be calculated via (category_point / item_cost + bonus_point + other_name_point + other_name_point)

I need to specify the fixed value for bonus_point, other_name_point, category_point in the table, etc It can be changed every month or so.

Price Range Example (Different from above) – if customer order any item from Motherboard category – point will be calculated base on item cost range like:

0.00 to £40 = 10 points

40.00 to £40 = 52 points

more than £40 = 64 points

I need to specify the point manually of the price range. This is not part of category_point / item_cost + bonus_point + other_name_point + other_name_point

How to design the tables for the points setting?

Answer 1

May be something like:

Customers:

• Id,
• Name,
• other details
• …

Orders:

• Id,
• OrderDate,
• CustomerId,
• …

*ItemsOrders:*

• ItemId,
• OrderId,
• …

Items:

• ItemId,
• ItemName,
• CategoryId,
• ITemCost,
• …

Categories:

• CategoryId,
• Name,
• …

CategoryPoints:

• CategoryId,
• PointId,
• …

Points::

• PointId,
• PointNam,
• PointCostType bit (‘fixed’ or ‘changing’),
• …

PointsCostsRanges: for not fixed pints only

• Id (Surrorgate key).
• PointId,
• FromRange.
• ToRange.

Note that:

• You didn’t say how many pints’ types are there for each category? Is there only three: bonus_point, other_name_point and other_name_point? If so you can get rid of the table Points and add three columns to the CategoryPoints table.
• In your example what 10 points actually mean? Does it mean the count of the points types that item have? for example if an itemm has three types like in your example bonus_point, other_name_point and other_name_point then it has 3 points or what?
• If these ranges can change every month may be you need to add date ranges.