I am attempting to create a data model for a sports league

There are two entities in my domain. The first entity is a Manager and the second is a Team.

A Manager has

  • personnel id
  • first name
  • last name
  • birth date
  • birthplace

A Team has one Manager

If these are the design constraints, then how can we connect these two constraints?


The unique identifier for Manager would be the personnel id. That identifier would migrate to Team as a column and thus refer back to Manager. This will ensure each Team can be managed by one and only one Manager. This constraint would be a Foreign Key constraint. The constraint on Manager, which specifies the personnel id as the key, would be called a Primary Key constraint.


@todd-everett is quite right.

But I propose a time-lined solution, as although a team is currently managed by PersonA, it has been managed by PersonB, PersonC, etc. in the past.

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