概念 model 中的关系（ER 图）

Question

I have a simple and probably. banal question. I am working on the first, conceptual phase of an entity-relationship diagram.

This DABMS will be used by some Managers, that will control (registrate and modify accounts) of customers.

In my diagram I have the two entities "MANAGER" and "CUSTOMER". Is it necessary to connect them with a relationship (M:N), to specify that the Managers are those who will manage the customers' account, or this relationship is unnecessary?

Answer 1

to specify that the Managers are those who will manage the customers

No. ER diagrams typically show relations that are reflected in your database.

Example, what would be visible in your ERD

• Each customer has a manager assigned who's responsible for this customer => 1:n - each customer has one manager but one manager can be responsible for multible customers.