{keyword} Union All: Select Null-- Kjag

If this was found in your own application's logs or user inputs, it is a sign that you should ensure you are using prepared statements or parameterized queries to prevent SQL injection attacks.

: This is a SQL comment symbol. It tells the database to ignore the rest of the original query, effectively "breaking" the intended logic to execute the injected command instead. {KEYWORD} UNION ALL SELECT NULL-- KJAg

: Someone is trying to see if they can extract sensitive data from your database. If this was found in your own application's

The sequence you provided, "{KEYWORD} UNION ALL SELECT NULL-- KJAg" , is a classic example of a . Purpose of the Payload "{KEYWORD} UNION ALL SELECT NULL-- KJAg"