SQL Injection: Combining Multiple Values into a Single Column | Portswiggers

Today’s lab focuses on SQL Injection: combining multiple values into one column, based on a challenge from the PortSwigger Web Security Academy.

In this video, I demonstrate how a UNION-based SQL injection attack can be used to merge multiple database values into a single output column when the application only displays limited results. This technique is essential for extracting useful data when only one column is reflected in the response.

Topics covered in this video:

Understanding output limitations in UNION-based SQL injection

Identifying a column that can display text

Combining multiple values into a single column

Practical data extraction techniques using SQL functions

Why this method is important in real-world exploitation

This walkthrough is intended strictly for educational purposes and is part of learning web application security, penetration testing, and bug bounty fundamentals.

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