SQL exercises on hospital Database: Write a query in SQL to find the name of the patients and the number of physicians they have taken appointment.

SQL hospital Database: Exercise-13 with Solution

13. From the following tables, write a SQL query to find the patients and the number of physicians they have taken appointment. Return Patient name as "Patient", number of Physicians as "Appointment for No. of Physicians".

Sample table: appointment

Sample table: patient

Sample Solution:

SELECT p.name "Patient",
       count(t.patient) "Appointment for No. of Physicians"
FROM appointment t
JOIN patient p ON t.patient=p.ssn
GROUP BY p.name
HAVING count(t.patient)>=1;

Sample Output:

      Patient      | Appointment for No. of Physicians
-------------------+-----------------------------------
 Grace Ritchie     |                                 2
 John Smith        |                                 3
 Dennis Doe        |                                 3
 Random J. Patient |                                 1
(4 rows)

Practice Online

E R Diagram of Hospital Database:

Have another way to solve this solution? Contribute your code (and comments) through Disqus.

Previous: From the following tables, write a SQL query to find the patients with their physicians by whom they got their preliminary treatment. Return Patient name as "Patient", address as "Address" and Physician name as "Physician".
Next: From the following table, write a SQL query to count number of unique patients who got an appointment for examination room ‘C’. Return unique patients as "No. of patients got appointment for room C".