Row-Level Security (RLS) is a new feature of SQL Server 2016 and Azure SQL Database that enables data access control based on the users executing those queries: if a user isn’t authorized to access certain rows in a table then those rows are automatically filtered out by the database engine. This feature promises to simplify design and coding of applications, especially in complex multi-tenancy environments, as the access control logic is moved from the application to the database. In short, instead of writing queries like this:
CREATE VIEW vwInventory AS ... (implements security logic); SELECT * FROM vwInventory WHERE isVisibleTo = 'Paul'
We write simple queries like this:
SELECT * FROM Inventory;
Isn’t that cool?