Joining table twice with output based n new table - sql

Question

I am having trouble joining a table twice on the same column.
Table People
name
phone_number
Pamela
113 555 7544
Jordan
328 555 9658
Haley
502 555 6712
Table Phone_calls
caller
receiver
duration
113 555 7544
328 555 9658
234
328 555 9658
502 555 6712
500
502 555 6712
113 555 7544
468
Desired output
duration
caller_name
receiver_name
234
Pamela
Jordan
SELECT name as caller_name, name as receiver_name, duration
FROM people
JOIN phone_calls ON people.phone_number=phone_calls.caller
JOIN phone_calls ON people.phone_number=phone_calls.receiver
ORDER BY duration;
How should differentiate the two name links I want to output?

Answer 1

This is where aliases make for an easier query:
select pc.duration, c.Name as Caller_name, r.Name as Receiver_name
from Phone_calls pc
join People c on c.phone_number = pc.caller
join People r on r.phone_number = pc.receiver
order by pc.duration;

Answer 2

I'm not sure if I understood your question correctly but, assuming the desired output you've mentioned is indeed the output you desire, this query correctly returns your output:
create table people (
nome varchar(50) primary key,
phone_number varchar(50)
);
insert into people values ('Pamela', '113 555 7544');
insert into people values ('Jordan', '328 555 9658');
insert into people values ('Haley', '502 555 6712');
select * from people;
create table phone_calls (
caller varchar(50),
receiver varchar(50),
durations int
);
insert into phone_calls values ('113 555 7544', '328 555 9658', 234);
insert into phone_calls values ('328 555 9658', '502 555 6712', 500);
insert into phone_calls values ('502 555 6712', '113 555 7544', 468);
select
tt.durations,
tt.caller_name,
p.nome as "receiver_name"
from
(
select
pc.durations,
p.nome as caller_name,
pc.receiver as telefone
from people p
left join phone_calls pc
on p.phone_number = pc.caller
) tt
left join people p
on tt.telefone = p.phone_number
where tt.caller_name = 'Pamela';