{keyword} Union All Select Null,null,null,null-- Uizf Info

If you found this in a "complete report" (such as a security scan or a web server log), it indicates that an automated tool or a manual actor has the system.

: Once the column count is known, they replace the NULL values with actual commands (e.g., version() , user() , or table_name ) to steal sensitive information. {KEYWORD} UNION ALL SELECT NULL,NULL,NULL,NULL-- Uizf

: This is a SQL comment symbol. It tells the database to ignore the rest of the original, legitimate query, effectively "breaking" the intended logic to execute the injected code. If you found this in a "complete report"