Question

I need to pull data from two tables, and it’s a bit over my head :

The first tables contains a list of members (member_id, username, email …)
The second table stores relations between members (id, member_id, friend_id)

When a member adds another member as a friend, both member_ids are stored in the second table.

Now I need to output that second table, I’d like to output usernames instead of numbers :

example :

{username corresponding to member_id} added {username corresponding to friend_id} as a friend

Can someone help with the query ?

Answer 1

Something like:

select tb1.username as member_name,
       tb2.username as friend_name
from   membertable as tb1
inner join
(
       membertable as tb2,
       memberrelationstable
)
on
(
    tb1.member_id = memberrelationstable.member_id and
    tb2.member_id = memberrelationstable.friend_id
)