From 62eb6a4a017df67098a7ce17e2b4a3fd1d0b1279 Mon Sep 17 00:00:00 2001
From: roadmap bot <135830415+roadmap-bot@users.noreply.github.com>
Date: Fri, 9 Jun 2023 01:53:04 +0100
Subject: [PATCH] chore: add resource under
 postgresql-dba:introduction:what-are-relational-databases

---
 .../101-introduction/100-what-are-relational-databases.md     | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/data/roadmaps/postgresql-dba/content/101-introduction/100-what-are-relational-databases.md b/src/data/roadmaps/postgresql-dba/content/101-introduction/100-what-are-relational-databases.md
index 69f91c0f9..ed7ce251b 100644
--- a/src/data/roadmaps/postgresql-dba/content/101-introduction/100-what-are-relational-databases.md
+++ b/src/data/roadmaps/postgresql-dba/content/101-introduction/100-what-are-relational-databases.md
@@ -27,4 +27,6 @@ Relational databases offer several advantages in terms of efficiency, flexibilit
 - **Scalability**: Relational databases can handle large amounts of structured data and can be scaled to accommodate growing data requirements.
 - **Querying**: The SQL (Structured Query Language) is used for querying, updating, and managing relational databases, providing a powerful and standardized way to access and manipulate the data.
 
-In summary, relational databases are a powerful and versatile tool for storing and managing structured data. Their ability to represent relationships among data and to ensure data integrity make them the backbone of many applications and services.
\ No newline at end of file
+In summary, relational databases are a powerful and versatile tool for storing and managing structured data. Their ability to represent relationships among data and to ensure data integrity make them the backbone of many applications and services.
+
+- [Relational Databases: concept and history](https://www.ibm.com/topics/relational-databases)
\ No newline at end of file