{keyword}) Union All Select Null,null,null,null,null-- Zkhd Official

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: This is a comment indicator that tells the database to ignore the rest of the original query that follows. {KEYWORD}) UNION ALL SELECT NULL,NULL,NULL,NULL,NULL-- ZkhD

: This part attempts to break out of the existing SQL query structure. The closing parenthesis ) is used to "close" a likely function or subquery in the application's original code. For more in-depth technical guides, you can visit