﻿ SQL: Find the nurses and the block where they are booked

# SQL Exercise: Find the nurses and the block where they are booked

## SQL hospital Database: Exercise-29 with Solution

29. From the following tables, write a SQL query to locate the nurses and the block where they are scheduled to attend the on-call patients.Return Nurse Name as "Nurse", Block code as "Block".

Sample table: nurse

Sample table: on_call

Sample Solution:

``````SELECT n.name AS "Nurse",
o.blockcode AS "Block"
FROM nurse n
JOIN on_call o ON o.nurse=n.employeeid;
``````

Sample Output:

```      Nurse      | Block
-----------------+-------
Carla Espinosa  |     1
Carla Espinosa  |     2
Laverne Roberts |     3
Paul Flowers    |     1
Paul Flowers    |     2
Paul Flowers    |     3
(6 rows)
```

Explanation:

The said query in SQL that retrieves the name of the nurse and the block they are on call for.

The JOIN clause joins the 'nurse' and 'on_call' tables based on the employeeid and nurse columns.

## Practice Online

E R Diagram of Hospital Database:

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Previous SQL Exercise: Name of the patients, their block, floor, room number.
Next SQL Exercise: Make a report of specified queries.

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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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