{keyword}) Union All Select Null,null,null,null,null-- Zkhd (Top 10 HOT)

: The attacker uses a specific number of NULL values to match the number of columns in the original query's SELECT statement. NULL is used because it is compatible with almost any data type (strings, integers, dates), maximizing the chance that the injected query will succeed.

: The number of NULL values (5 in this case) does not match the number of columns in the original table. {KEYWORD}) UNION ALL SELECT NULL,NULL,NULL,NULL,NULL-- ZkhD

For more in-depth technical guides, you can visit the Web Security Academy or community forums like Medium . : The attacker uses a specific number of

: This is likely a random string or a "signature" used by a vulnerability scanner (like Burp Suite or sqlmap) to track if the payload was successfully reflected in the application's response. {KEYWORD}) UNION ALL SELECT NULL,NULL,NULL,NULL,NULL-- ZkhD