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SELECT ceil(avg(Salary) - avg(REPLACE(Salary,'0',''))) FROM Employees;

select CAST( AVG(CAST(Salary as float)) - AVG(CAST(REPLACE(Salary ,0,'') as float) ) as int) from EMPLOYEES

Where is the problem ???

select round(avg(salary),0) - round(avg(replace(salary,0,'')),0) from employees;

SELECT CEIL(AVG(E.SALARY) - AVG(CAST(REPLACE(E.SALARY, '0', '') AS UNSIGNED))) AS RESULTING_ERROR FROM EMPLOYEES E;