Count number of clients in a routine in Mysql - mysql

Question

Hi I have a database in mysql and php use to read the data, I have a table called payments where insert payments routines that make customers then are three tables "payments, routines and customers," Now the issue is that I want to load the number of customers using routine id "3", I got it resolved but a detail escapes me, I need the client ID is not the same on the counter and thus can not be counted twice for the same customer in a rut when you have two payments that routine.
The statement that I have is:
select r.name_routine, count(p.id_routine)
from payments p,routines r,customers c
where p.id_client=c.id_client
and p.id_routine=r.id_routine
and p.id_routine='3'
Data set, in spanish:
id_pago monto activo fecha_pago fecha_vencimiento observacion id_cliente id_rutina id_oferta
17 300 1 2016-02-24 2016-03-24 Ninguna 11 3 NULL
13 450 1 2016-02-05 2016-07-05 Ninguna 8 NULL 8
16 270 1 2016-02-05 2016-03-05 Ninguna 7 5 NULL
11 490 1 2016-02-04 2016-04-04 Ninguna 8 NULL 5
15 300 0 2016-02-04 2015-03-04 Ninguna 11 3 NULL
9 330 1 2016-02-03 2016-03-03 Ninguna 11 10 NULL
12 400 1 2016-02-03 2016-05-03 Ninguna 10 NULL 7
10 500 1 2016-02-02 2016-06-02 Ninguna 10 NULL 4
14 420 1 2016-02-02 2016-05-02 Ninguna 8 NULL 9
5 250 0 2016-01-18 2016-02-18 Ninguna 5 7 NULL
8 320 0 2016-01-05 2016-02-05 Ninguna 9 9 NULL
7 250 0 2016-01-03 2016-02-03 Ninguna 7 7 NULL
6 300 0 2016-01-02 2016-02-02 Ninguna 6 6 NULL
2 520 1 2015-10-18 2016-03-18 Ninguna 2 NULL 2
3 290 0 2015-10-18 2015-11-18 Ninguna 3 4 NULL
4 550 0 2015-10-18 2016-01-18 Ninguna 4 NULL 3
In this table you can see that the routine "3" is used 2 times by the same customer (id_client 11), then my query should return the routine is used 1 time and not two, that's what I want to tell all clients that are in routine "3"
Try using distinct but returns the same result, how could you do this?

Answer 1

This should work
SELECT groupedTable.name_routine, COUNT(groupedTable.numbers) FROM
(
SELECT r.name_routine, count(p.id_routine) as numbers
FROM payments p,routines r,customers c
where p.id_client=c.id_client
and p.id_routine=r.id_routine
and p.id_routine='3'
GROUP BY p.id_client) as groupedTable

Answer 2

This should work:
select r.name_routine, count(distinct p.id_cliente)
from payments p,routines r,customers c
where p.id_client=c.id_client
and p.id_routine=r.id_routine
and p.id_routine='3'