{keyword} Union All Select Null,'qbqvq'||'zztyernefl'||'qqbqq',null,null,null,null,null,null,null-- Ijiy -

The librarian goes to the back (the database), finds the gardening books, and brings them to you.

This is the "gold standard" for security. It ensures the database treats all user input as simple text, never as executable code. The librarian goes to the back (the database),

You go to the librarian (the website) and ask, "Show me all books about Gardening " (the KEYWORD ). You go to the librarian (the website) and

: This command tells the database to combine the results of the original (legitimate) search with a second search created by the attacker. The string in the middle is a "fingerprint"—if

: The attacker uses NULL to match the number of columns in the original query without causing a data type error. The string in the middle is a "fingerprint"—if the word "ZZTyernefl" appears on the website, the attacker knows the injection worked and exactly which column displays data on the screen.

Instead of just saying "Gardening," you say: "Show me Gardening books AND ALSO go into the restricted office, look at the employee payroll, and tell me the name on the second paycheck."