Obsessed with Oracle PL/SQL

You will find below the rankings for the Logic Annual Championship for 2019, held in February 2020 on the Oracle Dev Gym . The number next to the player's name is the number of times that player has participated in a championship. Below the table of results for this championship, you will find another list showing the championship history of each of these players. Congratulations first and foremost to our top-ranked players: 1st Place: Stelios Vlasopoulos 2nd Place: Sartograph 3rd Place: NielsHecker Next, congratulations to everyone who played in the championship. We hope you found it entertaining, challenging and educational. And for those who were not able to participate in the championship, you can take the quizzes through the Practice feature. We will also make the championship as a whole available as a Workout, so you can take it just like these players did. Finally, many thanks to Eli Feuerstein, Logic Quizmaster who provided a very challenging set of quizzes...

Virtual Private Database (VPD), also referred to as row-level security or RLS, is a feature built into the Oracle Database that allows you to set up security policies on tables that restrict which rows a user can see or change based on the policy logic. One of the nicest things about VPD is that this logic (and the fact that a filter is being applied) is completely invisible to the user. They just see the data relevant to them and none the wiser about all that other data in the data. Here's a simple example to drive the point home: suppose I am building a health care application and it contains a patients table. The security policy is straightforward: A patient can only see their own information. A doctor can see only the information about their own patients. A clinic administrator can see information only about the patients in their clinic. In all three cases, the user would sign on to the application and execute the same query: SELECT * FROM patients and only thei...