-5025 Order By 1# -

The number 1 refers to the first column in the SELECT statement.

SQL Injection is a vulnerability where an attacker interferes with the queries an application makes to its database. The payload "-5025 ORDER BY 1#" is an "Inference" or "Error-based" probe used to determine the structure of a database table without having direct access to the source code. -5025 ORDER BY 1#

SELECT name, email FROM users WHERE id = "$input"; The number 1 refers to the first column

This is often a "false" or "null" value. By inputting a value that likely doesn't exist (like a negative ID), the attacker forces the application to return an empty result set or an error. This makes it easier to see how the database reacts when the injected code is added. ORDER BY 1 : This is the structural probe . SELECT name, email FROM users WHERE id =