-6599 Union All Select Null,null,null,null,null,'qbqvq'||'lxmaauyjqg'||'qqbqq',null,null,null-- Rwer -

: This is a SQL comment. it tells the database to ignore the rest of the legitimate query that was supposed to follow, preventing syntax errors.

: The attacker starts with a value that likely doesn't exist in the database. This forces the original query to return no results, making it easier to see the data injected by the attacker. : This is a SQL comment

In a technical context, this specific snippet is a . Anatomy of the Attack : This is a SQL comment

: The attacker uses NULL placeholders to match the exact number of columns in the original table. This is a "trial and error" phase used to find the correct database structure without triggering an error. : This is a SQL comment