﻿ SQL: Find the nurse who are the head of their department

# SQL Exercise: Find the nurse who are the head of their department

## SQL hospital Database: Exercise-2 with Solution

2. From the following table, write a SQL query to identify the nurses in charge of each department. Return nursename as “name”, Position as “Position”.

Sample table: nurse

Sample Solution:

``````SELECT name AS "Name",
POSITION AS "Position"
FROM nurse
``````

Sample Output:

```      Name      |  Position
----------------+------------
(1 row)
```

Explanation:

The said query in SQL that returns a list of names and their respective positions who are working as "Head Nurse" in the "nurse" table. The "AS" keyword is used to alias the column names to "Name" and "Position".

Pictorial presentation:

## Practice Online

E R Diagram of Hospital Database:

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

Previous SQL Exercise: List the nurses who are yet to be registered.
Next SQL Exercise: Physicians who is the head of each department.

What is the difficulty level of this exercise?

Test your Programming skills with w3resource's quiz.

﻿

## 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