Home/ Questions/Q 9272149
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-06-18T15:48:02+00:00

I have been asked to describe what it wrong with this data structure, and

  • 0

I have been asked to describe what it wrong with this data structure, and how I would improve it.

Here is the data structure:

Image

Here is what I have so far:

  • The Car price is set only if the car is in the showroom, it would make more sense to put the price of the car in the car table

  • It makes no sense to store NULL data in the Car Table, it would be better to have a layout similar to this:

    Car table

  • There needs to be a quantity heading to show how many of that particular car are in the showroom as some showrooms have multiple of the same cars

The new table I drew up still has repeating data, which I vaguely remember is a no no when drawing up a data structure, and so I think I need to make a 3rd table? I’m really not sure.. .

I just need a bit of help as to what is wrong with the current data structure and if there is any way to improve it, any help is appreciated.

Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    One problem is that the Car table stores two distinct things – it stores makes, and it stores models.

    So you should split that up, something like:

    Makes: columns makename, makecode

    Models: columns makecode (foreign key for makes), modelname, modelcode

    And now showroom table will only relate to models, so it can’t reference a make by mistake.

    Since one model can have many showroom table rows related to it, you can’t merge the two tables meaningfully, so keep them separate and go from there.

    • 0