UNION BASED

SQL Injection Mastering - https://portswigger.net/web-security/sql-injection

SQL Injection cheat sheet - https://portswigger.net/web-security/sql-injection/cheat-sheet

Listing Oracle Database Content - https://portswigger.net/web-security/sql-injection/examining-the-database/lab-listing-database-contents-oracle

Oracle Show Tables - https://www.oracletutorial.com/oracle-administration/oracle-show-tables/