Mega'/**/and/**/dbms_pipe.receive_message('a',2)='a -

: A logical operator used to append a new condition to the original query.

: This is the most effective defense. It ensures the database treats the input as data only, never as executable code. MEGA'/**/and/**/DBMS_PIPE.RECEIVE_MESSAGE('a',2)='a

: This is likely a placeholder or a legitimate input value followed by a single quote ( ' ). The quote is used to "break out" of the intended SQL query string. : A logical operator used to append a

: This is the core of the attack. It calls a built-in Oracle function. MEGA'/**/and/**/DBMS_PIPE.RECEIVE_MESSAGE('a',2)='a