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.

SELECT docname, COUNT(*) FROM doctor GROUP BY name HAVING COUNT(*) = 
    (SELECT MAX(c) FROM
        (SELECT COUNT(patient) AS c
         FROM doctor
         GROUP BY docname))

On the other hand if you require only the first entry, then

SELECT docname, COUNT(docname) FROM doctor 
GROUP BY name 
ORDER BY COUNT(docname) DESC LIMIT 1;