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

: In MySQL, this symbol marks the rest of the original query as a comment , effectively deleting the remaining code (like WHERE clauses or authentication checks) to bypass security. Purpose of This "Piece"

: 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. -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. : In MySQL, this symbol marks the rest

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 : In MySQL