text: -- Samantha was tasked with calculating the average monthly salaries for all employees in the EMPLOYEES table, but did not realize her keyboard's
  -- 0 key was broken until after completing the calculation. She wants your help finding the difference between her miscalculation (using salaries with any zeroes removed), and the actual average salary.
  -- Write a query calculating the amount of error (i.e.: actual - miscalculated
  -- average monthly salaries), and round it up to the next integer.
  
  SELECT CEIL(AVG(SALARY) - AVG(REPLACE(SALARY,'0', ''))) FROM EMPLOYEES;