What is an RDBMS?

RDBMS stands for Relational Database Management System.

An RDBMS is software used to create, store, manage, and query relational databases. It helps you safely manage structured data in tables.

Why an RDBMS is useful

An RDBMS is useful because it helps keep business data organised, reliable, and easier to query.

Where an RDBMS works well

A relational database works well when data has a clear structure and relationships between tables.

For example, an online shop might use separate tables like this:

These tables can be connected using common IDs such as:

Simple SQL example

This query shows how an RDBMS can connect related tables and summarise business information.

SELECT
    c.customer_name,
    COUNT(o.order_id) AS total_orders
FROM Customers AS c
LEFT JOIN Orders AS o
    ON c.customer_id = o.customer_id
GROUP BY
    c.customer_name;