SQL Exercise: Find physicians who are yet to be affiliated

SQL hospital Database: Exercise-10 with Solution

10. From the following tables, write a SQL query to find those physicians who are yet to be affiliated. Return Physician name as "Physician", Position, and department as "Department".

Sample table: physician

Sample table: affiliated_with

Sample table: department

Sample Solution:

SELECT p.name AS "Physician",
       d.name AS "Department"
FROM physician p
JOIN affiliated_with a ON a.physician=p.employeeid
JOIN department d ON a.department=d.departmentid
WHERE primaryaffiliation='false';

Sample Output:

    Physician     |           position           |    Department
 Christopher Turk | Surgical Attending Physician | General Medicine
 John Wen         | Surgical Attending Physician | General Medicine
(2 rows)


The said query in SQL that selects the name, position, and department of physicians who are not primary-affiliated with a department from the table physician, affiliated_with, and department.

The query links the physician and affiliated_with table based on the physician and employeeid columns, and affiliated_with and department table based on the department and departmentid columns. The affiliated_with table contains the foreign keys to the physician and department tables.

The WHERE clause filters the results and return only those physicians who are not primary-affiliated with a department.

The resulting output will be a table with the column headers labeled "Physician", "Position", and "Department", respectively.

Pictorial presentation:

Find the name of the physicians with department who are yet to be affiliated

Practice Online

E R Diagram of Hospital Database:

E R Diagram: SQL Hospital Database.

Have another way to solve this solution? Contribute your code (and comments) through Disqus.

Previous SQL Exercise: Physicians who are trained in a special treatment.
Next SQL Exercise: Name of the physicians who are not a specialized.

What is the difficulty level of this exercise?

Test your Programming skills with w3resource's quiz.

Follow us on Facebook and Twitter for latest update.

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


We are closing our Disqus commenting system for some maintenanace issues. You may write to us at reach[at]yahoo[dot]com or visit us at Facebook