SQL Exercise: Names of patients, their doctors, and medications

SQL hospital Database: Exercise-19 with Solution

19. From the following tables, write a SQL query to locate the patients' treating physicians and medications. Return Patient name as "Patient", Physician name as "Physician", Medication name as "Medication".

Sample table: patient

Sample table: prescribes

Sample table: physician

Sample table: medication

Sample Solution:

SELECT t.name AS "Patient",
       p.name AS "Physician",
       m.name AS "Medication"
FROM patient t
JOIN prescribes s ON s.patient=t.ssn
JOIN physician p ON s.physician=p.employeeid
JOIN medication m ON s.medication=m.code;

Sample Output:

  Patient   |  Physician  |  Medication
------------+-------------+--------------
 John Smith | John Dorian | Procrastin-X
 Dennis Doe | Molly Clock | Thesisin
 Dennis Doe | Molly Clock | Thesisin
(3 rows)

Explanation:

The said query in SQL that returns information about medications prescribed to patients by their physicians, including the patient's name, the physician's name, and the medication name.

The query performs a join between the 'patient', 'prescribes', 'physician', and 'medication' tables, based on their relational columns.

The 'prescribes' and 'patient' tables are joins based on the patient and ssn columns, the 'prescribes' and 'physician tables are joins based on the physician and employeeid columns, and the 'medication ' and the 'prescribes' and 'medication' tables are joins based on the medication and code columns.

Practice Online

E R Diagram of Hospital Database:

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