﻿ SQL SUBQUERIES: Identify all employees who work in departments located in the United Kingdom - w3resource

# SQL Subquery Exercises: Identify all employees who work in departments located in the United Kingdom

## SQL SUBQUERY: Exercise-27 with Solution

From the following tables, write a SQL query to find employees who work in departments located in the United Kingdom. Return first name.

Sample table: employees

Sample table: departments

Sample table: locations

Sample table: countries

Sample Solution:

``````SELECT first_name
FROM employees
WHERE department_id IN
(SELECT department_id
FROM departments
WHERE location_id IN
(SELECT location_id
FROM locations
WHERE country_id =
(SELECT country_id
FROM countries
WHERE country_name='United Kingdom')));
``````

Sample Output:

```first_name
Susan
```

Pictorial Presentation:

## Query Visualization:

Duration:

Rows:

Cost:

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## SQL: Tips of the Day

How to count occurrences of a column value in SQL?

Input table:

```id | age
--------
0  | 25
1  | 25
2  | 23
```
```SELECT age, count(age)
FROM Students
GROUP by age
```

Output:

```id | age | count
----------------
0  | 25  | 2
1  | 25  | 2
2  | 23  | 1
```

Ref: https://bit.ly/3zbLPQm