SQL - Displaying entries that are the max of a count?

Question

CREATE TABLE doctor( patient CHAR(13), docname CHAR(30) );

Say I had a table like this, then how would I display the names of the doctors that have

Answer 1

This should do it for you:

SELECT docname
FROM doctor
GROUP BY docname
HAVING COUNT(patient)=
    (SELECT MAX(patientcount) FROM
        (SELECT docname,COUNT(patient) AS patientcount
         FROM doctor
         GROUP BY docname) t1)