Mega'and(select*from(select - Sleep(2))a/**/union/**/select 1)='

: This is used to combine the results of the original query with a new query, often used to extract data like usernames or passwords.

: Log in as an administrator without a password. : This is used to combine the results

: This is the most effective defense. It treats all user input as "data" rather than "executable code," so the sleep(2) command is never actually run. It treats all user input as "data" rather

: This part attempts to "break out" of a text string in the database query. The single quote ( ' ) is used to end the intended data input so that the database starts reading the following text as a command. : These are comment tags used to bypass

: These are comment tags used to bypass basic security filters that might block spaces.

Specifically, this is a attempt. The goal of this specific string is to force the server to "sleep" (pause) for a set amount of time, allowing an attacker to confirm if the input is being executed directly by the database. Breakdown of the Payload