If you are a developer, seeing this is a signal to audit your code immediately. Here are the gold-standard defenses:
: This is likely a placeholder for a legitimate search term or ID used by an application. If you are a developer, seeing this is
: This command tells the database to combine the results of the original query with a new, forged query. If you found this in your website logs,
If you found this in your website logs, email subjects, or contact forms, someone (or more likely an automated bot) is . They are looking for "entry points" where user input isn't properly cleaned before being sent to the database. How to protect your data It tells the database to ignore the rest
: This is a comment operator in SQL. It tells the database to ignore the rest of the legitimate code that follows, effectively neutralizing any security checks at the end of the original query. Why you might be seeing this