SQL Exercise: Find the name and department of the physician

SQL hospital Database: Exercise-8 with Solution

8. From the following tables, write a SQL query to identify the physician and the department with which he or she is affiliated. Return Physician name as "Physician", and department name as "Department".

Sample table: physician

Sample table: department

Sample table: affiliated_with

Sample Solution:

SELECT p.name AS "Physician",
       d.name AS "Department"
FROM physician p,
     department d,
     affiliated_with a
WHERE p.employeeid=a.physician
  AND a.department=d.departmentid;

Sample Output:

     Physician     |    Department
 John Dorian       | General Medicine
 Elliot Reid       | General Medicine
 Christopher Turk  | General Medicine
 Christopher Turk  | Surgery
 Percival Cox      | General Medicine
 Bob Kelso         | General Medicine
 Todd Quinlan      | Surgery
 John Wen          | General Medicine
 John Wen          | Surgery
 Keith Dudemeister | General Medicine
 Molly Clock       | Psychiatry
(11 rows)


The said query in SQL that selects the name of physicians and the department they are affiliated with from the physician table, department table, and affiliated_with table.

The query uses a join to combine data from the three tables. It selects the physician name from the physician table, department name from the department table, and uses the affiliated_with table to link the two. The affiliated_with table contains foreign keys to the physician and department tables, which are used to join the tables on their respective IDs.

The column headers will be labeled "Physician" and "Department", respectively.

Pictorial presentation:

Find the name of the physician and the departments they are affiliated with

Practice Online

E R Diagram of Hospital Database:

E R Diagram: SQL Hospital Database.

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Previous SQL Exercise: Count the number of unavailable rooms.
Next SQL Exercise: Physicians who are trained in a special treatment.

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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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