This is used to "break out" of a predefined search box, telling the database, "Stop looking for the keyword and start listening to my new command."
This type of command was immortalized in the famous xkcd comic about In the comic, a mother names her son Robert'); DROP TABLE Students;-- to wipe out his school's record system. It became the definitive cautionary tale for programmers: never trust user input. Why It Still Matters {KEYWORD}' ORDER BY 1-- hFdK
This asks the database to sort the results by the first column. If it works, the attacker tries ORDER BY 2 , ORDER BY 3 , and so on. The moment the page crashes, they know exactly how many columns are in your secret database. This is used to "break out" of a