1. Vertabelo
  2. Fragen
0
Beantwortet

Artificial primary keys in many-to-many relationships

Sergio González (IT teacher) vor 5 Jahren • aktualisiert von Adam Mościcki vor 5 Jahren • 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?

GUT, ICH BIN ZUFRIEDEN.
Zufriedenheit

Thanks for the answer!

Zufriedenheit von Sergio González (IT teacher) vor 5 Jahren
Beantwortet
Adam Mościcki vor 5 Jahren

Hello Sergio,

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,

Adam

Customer support service by UserEcho