Question

I want to create a table of users, lets name it USERS and I want that each
user will be able to point to more users. You can think of it as a user that have some friends who are also user, and have more friends that are also user and so on.

Do I need to use many to many relation between this table to itself or use a junction table?

For instance the table (without the notation of junction table) might look like:

| USER_ID(PK) | NAME | AGE | _ID(FK) |

Answer 1

You should use a junction table where each row contains details of a “relationship” between two users.

|UserID1|UserID2|
|      1|      2|
|      2|      3|