-3216' Union All Select 34,34,34,34# -

: This part creates a "fake" row of data. Attackers use this to determine the exact number of columns required for the UNION to work, as both queries must have the same number of columns.

: This operator combines the results of the original query with a new one. By using UNION ALL , the attacker can inject their own data into the results page. -3216' UNION ALL SELECT 34,34,34,34#

: If the page displays the number "34" several times, it confirms the site is vulnerable to SQL injection. : This part creates a "fake" row of data

The string -3216' UNION ALL SELECT 34,34,34,34# is a classic example of a used to exploit vulnerabilities in database-driven applications. Breaking Down the Payload -3216' UNION ALL SELECT 34,34,34,34#