When you are starting to put together a business layer from a physical data layer that has tables with self-referential integrity, you may find aliasing the table helpful in laying out the clean data model. The example below uses an EMPLOYEE to MANAGER relationship on the EMPLOYEE table where the MANAGER_ID references back to the EMPLOYEE_ID on the same EMPLOYEE table. Using the alias feature helps separate these self-referential relationships into their own tables and allows ease of use on the presentation layer. We will be working with tables from the HR Schema (In the Oracle APEX XE Database) to … Read More