How to count how many doctors are booked by each patient?

Question

I need the results to look like:

PatientID   Doctors
Patient1    3
Patient2    2
Patient3    1

The booked table looks like this

Answer 1

try this :

SELECT PatientID, count(DoctorID) FROM `GPS ` group by PatientID

Answer 2

Use Group by over a temp table with distinct patient and doctor

 select Patient, count(*)
 from (
 select distinct Bookings.PatientID as Patient ,DoctorID as Doctors 
 from Bookings  ) as t

 Group by Patient;

Answer 3

You are looking for count(distinct):

select b.PatientID, count(distinct b.DoctorID) as NumDoctors
from Bookings b
group by b.PatientID;

Answer 4

I did this and it worked:

select PatientID as Patient, count(distinct(DoctorID)) as Doctors from Bookings, Patients group by PatientID;

Thank you for the help!