I'm working on an app that has mainly two entities: Company and User. A User can be an employee, owner, or a partner.

My current approach of modelling this is: enter image description here

Capacity is enum with possible values: employee, owner, partner

Someone got me confused suggesting I should have three separate tables for each of these capacities, which I don't think is right.

I'm terribly unsure whether the capacity could grow to more in future.

Should I create another capacity table and reference it in Personnel as a foreign key, in case we wish to add more capacity? Would that be a scalable (and right) approach?

Thank you.

  • Schema design is an iterative process (look at the links and links within) and providing advice on schema design is a bit beyond the scope of this forum. What you want to do is to implement a solution, play around with it, fix the bugs (and there WILL be bugs), change the schema - then rinse and repeat. I suggest that you do that and then come back to us if you have more specific questions. p.s. welcome to the forum! :-)
    – Vérace
    Commented Feb 29, 2020 at 12:35
  • In your model a company can have more than 1 owner. Is this what you want? Also, a user can be an owner, employee or partner of multiple companies. Is this what you want? Commented Feb 29, 2020 at 12:56
  • @Colin'tHart yes, you're right Commented Feb 29, 2020 at 13:27

1 Answer 1


I would not have separate tables but you might want to consider not using enum for the capacity column.

Instead use a table named, perhaps, capacity that has an id referenced in the personnel table (much like user ID and company ID). That makes it trivial to add new titles/positions without disturbing anything else.

  • And here's why you don't want to use ENUMs!
    – Vérace
    Commented Feb 29, 2020 at 12:31
  • yup, that's exactly what I had in my mind. Thanks very much. Commented Feb 29, 2020 at 12:33

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