-1740) Union All Select 34,34,34# 〈TOP-RATED ✦〉

Extract sensitive information (usernames, passwords, PII) by replacing the constants with table names [1]. Bypass authentication mechanisms.

This tells the database to combine the results of the original query with a new query created by the attacker [3, 4]. -1740) UNION ALL SELECT 34,34,34#

Sanitize inputs to reject special characters like ) , # , and SQL keywords in fields where they don't belong [8]. Sanitize inputs to reject special characters like )

Attackers use repeating constants like this to determine the number of columns in the original table [3]. If the page loads without an error, they know the table has exactly three columns. If successful, this probe allows an attacker to:

If successful, this probe allows an attacker to: Map the database structure (column counts and data types).

This is an attempt to "break out" of the original query logic by providing a non-existent ID and closing any open parentheses.

Implement parameterized queries immediately. This treats all user input as data, never as executable code [6, 7].