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SQL Exercise: Make a report of specified queries

SQL hospital Database: Exercise-30 with Solution

30. From the following tables, write a SQL query to get
a) name of the patient,
b) name of the physician who is treating him or her,
c) name of the nurse who is attending him or her,
d) which treatement is going on to the patient,
e) the date of release,
f) in which room the patient has admitted and which floor and block the room belongs to respectively.

Sample table: undergoes


Sample table: patient


Sample table: physician


Sample table: nurse


Sample table: stay


Sample table: room


Sample Solution:


-- This SQL query retrieves various information about patients undergoing treatment, including patient details, physician details, nurse details (if available), treatment details, room details, and block details.

SELECT p.name AS "Patient", -- Selects the name column from the patient table and aliases it as "Patient"
       y.name AS "Physician", -- Selects the name column from the physician table and aliases it as "Physician"
       n.name AS "Nurse", -- Selects the name column from the nurse table and aliases it as "Nurse" (if available)
       s.end_time AS "Date of release", -- Selects the end_time column from the stay table and aliases it as "Date of release"
       pr.name as "Treatement going on", -- Selects the name column from the procedure table and aliases it as "Treatment going on"
       r.roomnumber AS "Room", -- Selects the roomnumber column from the room table and aliases it as "Room"
       r.blockfloor AS "Floor", -- Selects the blockfloor column from the room table and aliases it as "Floor"
       r.blockcode AS "Block" -- Selects the blockcode column from the room table and aliases it as "Block"
FROM undergoes u -- Specifies the undergoes table
JOIN patient p ON u.patient=p.ssn -- Joins the undergoes table with the patient table on the patient's SSN
JOIN physician y ON u.physician=y.employeeid -- Joins the undergoes table with the physician table on the physician's employee ID
LEFT JOIN nurse n ON u.assistingnurse=n.employeeid -- Left joins the undergoes table with the nurse table on the assisting nurse's employee ID
JOIN stay s ON u.patient=s.patient -- Joins the undergoes table with the stay table on the patient
JOIN room r ON s.room=r.roomnumber -- Joins the stay table with the room table on the room number
JOIN procedure pr on u.procedure=pr.code; -- Joins the undergoes table with the procedure table on the procedure code

Sample Output:

  Patient   |    Physician     |      Nurse      |   Date of release   | Room | Floor | Block
------------+------------------+-----------------+---------------------+------+-------+-------
 John Smith | Christopher Turk | Carla Espinosa  | 2008-05-02 00:00:00 |  111 |     1 |     2
 John Smith | John Wen         | Carla Espinosa  | 2008-05-03 00:00:00 |  111 |     1 |     2
 Dennis Doe | Christopher Turk | Laverne Roberts | 2008-05-07 00:00:00 |  112 |     1 |     2
 Dennis Doe | Todd Quinlan     |                 | 2008-05-09 00:00:00 |  112 |     1 |     2
 John Smith | John Wen         | Carla Espinosa  | 2008-05-10 00:00:00 |  112 |     1 |     2
 Dennis Doe | Christopher Turk | Paul Flowers    | 2008-05-13 00:00:00 |  112 |     1 |     2
(6 rows)

Explanation:

The said query in SQL that retrieves information such as the patient name, physician name, nurse name (if available), date of release, treatment going on, room number, floor, and block.

The JOIN keyword is used to join tables based on a common column.

The 'undergoes' and the 'patient' tables are joined based on the common columns patient and ssn, the 'physican' and 'undergoes' tables are joined based on the common columns employeeid and physician.

The LEFT JOIN keyword is used to retrieve information from the nurse table, but also include records where there is no match in the nurse table.

The 'undergoes' and the 'stay' tables are joined based on the common columns patient, the 'stay' and 'room' tables are joined based on the common column room and roomnumber, and the 'undergoes' and the 'procedure' tables are joined based on the common columns procedure and code.

Practice Online


E R Diagram of Hospital Database:

E R Diagram: SQL Hospital Database.

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Previous SQL Exercise: Find the nurses and the block where they are booked.
Next SQL Exercise: Physicians, a medical procedure without certification.

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