{keyword} Union All Select Null-- Kjag Apr 2026

: The UNION operator combines the results of two or more SELECT statements. By using SELECT NULL , a tester can determine how many columns the original database query expects without triggering a data-type error.

: 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

: This is a random string (often called a "canary") used to identify the specific injection point in the application's output or logs. Context in "Content Production" : The UNION operator combines the results of