﻿ SQL - Employee who works in that department which ID is 40

# SQL Exercises: Employee who works in that department which ID is 40

## SQL SUBQUERY: Exercise-40 with Solution

From the following table, write a SQL query to find those employees whose salary matches that of the employee who works in department ID 40. Return first name, last name, salary, and department ID.

Sample table: employees

Sample Solution:

``````SELECT first_name, last_name, salary, department_id
FROM employees
WHERE salary IN (
SELECT salary
FROM employees
WHERE department_id = 40);
``````

Sample Output:

```first_name	last_name	salary	department_id
Shanta		Vollman		6500.00		50
Susan		Mavris		6500.00		40
```

Code Explanation:

The said query in SQL that retrieves the first name, last name, salary, and department id of all employees whose salary is equal to the salary of at least one employee who belongs to department id 40.
The WHERE clause specified is checking if the salary of each employee is found in the list of salaries of employees who belong to department id 40. Using the IN operator and a subquery in the WHERE clause, the condition retrieves the list of salaries of employees in department id 40 and checks each employee's salary.

Visual Presentation:

Alternative Solutions:

Using Self-Join:

``````
SELECT e1.first_name, e1.last_name, e1.salary, e1.department_id
FROM employees e1
JOIN employees e2 ON e1.salary = e2.salary
WHERE e2.department_id = 40;
``````

Using EXISTS:

``````
SELECT first_name, last_name, salary, department_id
FROM employees e1
WHERE EXISTS (
SELECT 1
FROM employees e2
WHERE e2.department_id = 40 AND e1.salary = e2.salary
);
``````

## Query Visualization:

Duration:

Rows:

Cost:

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Previous SQL Exercise: Department where the employee works with ID 201.
Next SQL Exercise: Employees who work in the department Marketing.

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## SQL: Tips of the Day

How to combine date from one field with time from another field - MS SQL Server

You can simply add the two.

• if the Time part of your Date column is always zero
• and the Date part of your Time column is also always zero (base date: January 1, 1900)

Adding them returns the correct result-

```SELECT Combined = MyDate + MyTime FROM MyTable
```

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

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