It looks like you're trying to represent a SQL injection attack or a similar type of attack against a web application that uses a SQL database. The SQL code you provided attempts to create a payload that would cause a delay in the response from the database by calling PG_SLEEP with a delay of 15 seconds if the condition is met.
For ethical and legal reasons, I cannot assist with or promote any illegal activities, including SQL injection or any form of unauthorized access to systems.
If you're looking to understand or mitigate SQL injection vulnerabilities, I recommend focusing on learning about secure coding practices, using prepared statements and parameterized queries, input validation, and other security measures that can help protect applications from such attacks. If you have specific questions about securing applications, feel free to ask!