SQL Exercise: Patients with an appointment on the given date

SQL hospital Database: Exercise-17 with Solution

17. From the following tables, write a SQL query to locate the patients who attended the appointment on the 25th of April at 10 a.m. Return Name of the patient, Name of the Nurse assisting the physician, Physician Name as "Name of the physician", examination room as "Room No.", schedule date and approximate time to meet the physician.

Sample table: patient

Sample table: appointment

Sample table: nurse

Sample table: physician

Sample Solution:

SELECT t.name AS "Name of the patient",
       n.name AS "Name of the Nurse assisting the physician",
       p.name AS "Name of the physician",
       a.examinationroom AS "Room No.",
       a.start_dt_time
FROM patient t
JOIN appointment a ON a.patient=t.ssn
JOIN nurse n ON a.prepnurse=n.employeeid
JOIN physician p ON a.physician=p.employeeid
WHERE start_dt_time='2008-04-25 10:00:00';

Sample Output:

 Name of the patient | Name of the Nurse assisting the physician | Name of the physician | Room No. |    start_dt_time
---------------------+-------------------------------------------+-----------------------+----------+---------------------
 John Smith          | Laverne Roberts                           | John Dorian           | A        | 2008-04-25 10:00:00
 Dennis Doe          | Paul Flowers                              | Percival Cox          | B        | 2008-04-25 10:00:00
(2 rows)

Explanation:

The said query in SQL that returns information about the patient, nurse, physician, examination room number, and start date and time for a specific appointment that took place on April 25, 2008, at 10:00 AM.

The query join the 'patient', 'appointment', 'nurse', and 'physician' tables, based on their common columns.

The 'appointment' and 'patient' tables linked based on the patient and ssn columns, the 'appointment' and 'nurse' tables based on the prepnurse and employeeid columns, and the 'appointment' and 'physician' table based on the physician and employeeid columns.

The query filters the results using a WHERE clause to retrieve only the appointment that took place on April 25, 2008, at 10:00 AM.

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E R Diagram of Hospital Database:

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