-2563) Order By 1# -

: In many SQL dialects (like MySQL), the hash symbol marks the start of a comment. This tells the database to ignore the rest of the original, "real" code that followed the injection point, preventing syntax errors that would stop the attack from working. Why You Might See This

: Tools like Burp Suite or sqlmap automatically probe websites for these vulnerabilities. -2563) ORDER BY 1#

: This is used to close a parenthesis that might exist in the original, legitimate query's code. : In many SQL dialects (like MySQL), the

If you are a website owner and see this in your logs or reviews, it is a sign that someone is testing your site's security. You should ensure your code uses or parameterized queries to prevent these attacks from succeeding. : This is used to close a parenthesis

: Someone checking if a site is secure.

: This command tells the database to sort the results by the first column. In an attack, this is often used to "fingerprint" the database—if the page loads normally, the attacker knows there is at least one column. They will then try ORDER BY 2 , 3 , etc., until the page breaks, revealing exactly how many columns are in the table.