Question

I have a table named USERS with user_id as primary key and user_name.

I have another table USERS_ACT with user_act_id primary key, user_act_user_id and another 2 columns.

I need user_act_user_id to be foreign key in USERS? How can I achieve this?

This is my first day in SQL so please be kind to explain if what I ask is wrong.

Answer 1

let’s assume you are not the DB admin and you just want to get all the active users’ names ;))

select users.user_name
from users
join users_act on users.user_id = users_act.user_act_user_id