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7.8

Help with MYSQL Query

Asked by kinko899 in MySQL Server

Tags: group_by, max

Hi...I am trying to write a query in MYSQL that will review my ATTENDS_EXAM table and determine which doctor has examined the most patients this week and display how many patients he or she examined.

I created the following query and it displays the results but it does it for all of the doctors and not just the one with the maximum exams. Below is my query:

SELECT Doctor_Name, Count(Doctor_Name)
FROM ATTENDS_EXAM
WHERE Examination_Date > 20041017
GROUP BY Doctor_Name;

This is my output from my query:

Doctor_Name Count(Doctor_Name)
Dr. Smith 2
Dr. Jones 3

I am confused on how to go about modifying this query so it will only print out the results for Dr. Jones as he performed the most exams this week ?

I created the following two queries but none of them seem to work:

SELECT Doctor_Name
FROM ATTENDS_EXAM
WHERE Examination_Date > 20041017
GROUP_BY Doctor_Name
HAVING Max(Count(Doctor_Name));

SELECT Doctor_Name
FROM ATTENDS_EXAM
WHERE Examination_Date > 20041017 AND count(Doctor_Name) = Max(Count(Doctor_Name))
GROUP_BY Doctor_Name

SELECT Doctor_Name
FROM ATTENDS_EXAM
WHERE Examination_Date > 20041017 AND count(Doctor_Name) is Max(Count(Doctor_Name))
GROUP_BY Doctor_Name

None of these 3 queries seemed to work and I got error messages. Any have some suggestions ?

Thanks :-)

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Help with MYSQL Query

Asked by kinko899 in MySQL Server

Tags: group_by, max

About this solution