SQL Exercise: Medical procedures done after certification expired
SQL hospital Database: Exercise-34 with Solution
34. From the following table, write a SQL query to find all physicians who have completed medical procedures with certification after their certificates expired. Return Physician Name as "Physician", Position as" Position", Procedure Name as "Procedure", Date of Procedure as "Date of Procedure", Patient Name as "Patient", and expiry date of certification as "Expiry Date of Certificate".
Sample table: physician
Sample table: undergoes
Sample table: patient
Sample table: procedure
Sample table: trained_in
Sample Solution:
SELECT p.name AS "Physician",
p.position AS "Position",
pr.name AS "Procedure",
u.date AS "Date of Procedure",
pt.name AS "Patient",
t.certificationexpires AS "Expiry Date of Certificate"
FROM physician p,
undergoes u,
patient pt,
PROCEDURE pr,
trained_in t
WHERE u.patient = pt.ssn
AND u.procedure = pr.code
AND u.physician = p.employeeid
AND Pr.code = t.treatment
AND P.employeeid = t.physician
AND u.Date > t.certificationexpires;
Sample Output:
Physician | Position | Procedure | Date of Procedure | Patient | Expiry Date of Certificate --------------+------------------------------+----------------------------+---------------------+------------+------------------------- Todd Quinlan | Surgical Attending Physician | Obfuscated Dermogastrotomy | 2008-05-09 00:00:00 | Dennis Doe | 2007-12-31 (1 row)
Explanation:
The said query in SQL that selects the physician's name and position, the name of the procedure, the date of the procedure, the patient's name, and the expiry date of the physician's certificate for the procedure from the tables 'undergoes', 'patient', 'procedure', 'trained_in' and 'physician'.
The query joins the tables 'undergoes' and 'patient' based on the columns patient and ssn, the tables 'undergoes' and 'procedure' based on the columns procedure and code, the tables 'procedure' and 'trained_in' based on the columns code and treatment, and the tables 'physician' and 'trained_in' based on the columns employeeid and physician.
The WHERE clause at the end of the query filters the results to only include procedures performed after the physician's certification has expired.
Practice Online
E R Diagram of Hospital Database:

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Previous SQL Exercise: Find all physicians who completed a medical procedure.
Next SQL Exercise: Find nurses who have ever been on call for room 122.
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SQL: Tips of the Day
Grouped LIMIT in PostgreSQL: Show the first N rows for each group?
db=# SELECT * FROM xxx; id | section_id | name ----+------------+------ 1 | 1 | A 2 | 1 | B 3 | 1 | C 4 | 1 | D 5 | 2 | E 6 | 2 | F 7 | 3 | G 8 | 2 | H (8 rows)
I need the first 2 rows (ordered by name) for each section_id, i.e. a result similar to:
id | section_id | name ----+------------+------ 1 | 1 | A 2 | 1 | B 5 | 2 | E 6 | 2 | F 7 | 3 | G (5 rows)
PostgreSQL v9.3 you can do a lateral join
select distinct t_outer.section_id, t_top.id, t_top.name from t t_outer join lateral ( select * from t t_inner where t_inner.section_id = t_outer.section_id order by t_inner.name limit 2 ) t_top on true order by t_outer.section_id;
Database: PostgreSQL
Ref: https://bit.ly/3AfYwZI
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