select emp_name, dept_id, salary, row_number() over(partition by dept_id order by salary desc), rank() over(partition by dept_id order by salary desc), dense_rank ...

Problem: Starting from the HR department head (dept_id = 1, manager_id is NULL), list all employees in that reporting chain (head + all direct/indirect reports).

👉 Learn how to evaluate the tangent of an angle in degrees using the sum/difference formulas. To do this, we first express the given angle as a sum or a difference of two (easy to evaluate) angles, ...