This article suggests that the DB used by Salesforce is Oracle -- [https://www.xplenty.com/blog/the-salesforce-database-explained/#:~:text=Get%20Started-,About%20the%20Salesforce%20Database,have%20a%20semi%2Dsymbiotic%20relationship](https://www.xplenty.com/blog/the-salesforce-database-explained/#:%7E:text=Get%20Started-,About%20the%20Salesforce%20Database,have%20a%20semi%2Dsymbiotic%20relationship).

If that is so, then why is Salesforce abstracting PL/SQL and instead offers SOQL?