-4640 Union All Select Null,null,null,null,'qbqvq'||'lbznmmwdachxaypteqetdoupxsqdsedwqcwkldne'||'qqbqq',null,null,null,null-- Exgp «iPad»

: A comment marker that tells the database to ignore the rest of the original query, preventing syntax errors.

: Scanners look for the unique middle string ( LBzNMMwda... ) surrounded by these markers in the server's response. If it appears, the vulnerability is confirmed. -- ExGP : : A comment marker that tells the database

: Likely used as an invalid ID to force the original query to return no results, making the injected data the only output. : A comment marker that tells the database