Artificial primary keys in many-to-many relationships
Sergio González (IT teacher) 3 years ago • updated by Adam Mościcki 3 years ago • 1
Checking your article "A Dating App Data Model" I saw that in relations that appear from a many-to-many relationship (for instance between relations "user_account" and "gender") you add an artificial primary key (in the case exposed, primary key is a numeric field "id" but the primary key should be the combination of "user_account_id" and "gender_id").
Is there a technical reason to do that?
Customer support service by UserEcho
You are right, the primary key is an artifical (surrogate) primary key.
To be honest, I don't know the reason.
The best way to get the answer is to ask directly in the article: https://www.vertabelo.com/blog/a-dating-app-data-model/
Hope this helps,