---
title: "How to JOIN Tables in DB2: SQL Query"
description: "DB2 Join SQL query is explained with the syntax and two Tables of Employees and Departments to understand easily."
url: https://srinimf.com/2023/07/24/how-to-retrieve-two-tables-data-using-db2-join/
date: 2023-07-24
modified: 2026-10-10
author: "Srini"
image: https://i0.wp.com/srinimf.com/wp-content/uploads/2023/07/pexels-photo-3194523.jpeg?fit=1880%2C1254&ssl=1
categories: ["DB2"]
tags: ["DB2 JOIN SQL Query"]
type: post
lang: en
---

# How to JOIN Tables in DB2: SQL Query

Relational databases use JOIN operations [to combine](https://srinimf.com/2023/06/19/how-to-merge-multiple-csv-files-top-pandas-program/) data from different tables for analysis. DB2, a popular database management system, offers powerful JOIN functionalities. In this blog post, we will explore the types, syntax, and examples of DB2 JOIN operations. By the end, you will have the knowledge to effectively use JOINs in DB2 for data retrieval and analysis.

Related[Hierarchical Database Vs. Relational](https://srinimf.com/2014/07/13/hierarchical-vs-rdbms/)

![DB2 Join SQL Query](https://i0.wp.com/srinimf.com/wp-content/uploads/2023/07/pexels-photo-6912889.jpeg?resize=867%2C1300&ssl=1)*Photo by Teona Swift on Pexels.com*

## **Join in DB2**

In this article, we will cover:

- Understanding the fundamentals of JOIN operations in DB2.
- Examining practical scenarios using [SQL query to](https://srinimf.com/2014/04/30/sql-query-to-get-empids-department-wise/) perform JOIN operations with step-by-step explanations.

Here are two tables. Employees” and “Departments”. Then run the JOIN [SQL query](https://srinimf.com/2024/04/06/salavgsal-sql-query-how-to-write-in-pyspark-and-pandas/) [to retrieve](https://srinimf.com/2011/10/06/db2-spufi-comparison-timestamp/) the required information.

**Employees Table:**

| EmployeeID | FirstName | LastName | DepartmentID |
| --- | --- | --- | --- |
| 1 | John | Doe | 101 |
| 2 | Jane | Smith | 102 |
| 3 | Robert | Johnson | 101 |
| 4 | Emily | Brown | 103 |
| 5 | Michael | Lee | 102 |

*Table 1*

**Departments Table:**

| DepartmentID | DepartmentName | ManagerID |
| --- | --- | --- |
| 101 | HR | 1 |
| 102 | IT | 2 |
| 103 | Finance | 4 |

*Table 2*

## **Join SQL Query**

```
SELECT e.EmployeeID, e.FirstName, e.LastName, d.DepartmentName, m.FirstName AS ManagerFirstName, m.LastName AS ManagerLastName 
FROM Employees e 
JOIN Departments d 
ON e.DepartmentID = d.DepartmentID 
JOIN Employees m ON d.ManagerID = m.EmployeeID;
```

**Result:**

| EmployeeID | FirstName | LastName | DepartmentName | ManagerFirstName | ManagerLastName |
| --- | --- | --- | --- | --- | --- |
| 1 | John | Doe | HR | John | Doe |
| 2 | Jane | Smith | IT | Jane | Smith |
| 3 | Robert | Johnson | HR | John | Doe |
| 4 | Emily | Brown | Finance | Emily | Brown |
| 5 | Michael | Lee | IT | Jane | Smith |

*Result*

In the above query, we used JOIN operations to connect the “Employees” and “Departments” tables twice. The first JOIN connects the tables based on the “DepartmentID” column, and the second JOIN connects the tables based on the “ManagerID” and “EmployeeID” columns to retrieve the names of the department managers.

As a result, we get a list of all employees with their respective department names and the names of their department managers.

## SQL Bootcamp

[>>Buy NOW](https://www.amazon.in/dp/1913470415/?tag=srinimf-21)

Related

- [Join Vs Sub-query Top Differences to Read Today](https://srinimf.com/2010/04/20/db2-join-vs-sub-query/)DateApril 20, 2010
- [DB2 SQL: How to Write Self-join example](https://srinimf.com/2016/01/23/db2-complex-sql-query-on-self-join-example/)DateJanuary 23, 2016
- [Joins and Their Types in DB2 SQL](https://srinimf.com/2012/07/10/sql-db2-and-joins/)DateJuly 10, 2012

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