[HackerRank] Basic Aggregation : The Blunder

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.

Input Format

The EMPLOYEES table is described as follows:

Note : Salaryis measured in dollars per month and its value is < 10^5.

Sample Input

Sample Output

2061

Explanation

The table below shows the salarieswithout zeroesas they were entered by Samantha:

Samantha computes an average salary of 98.00. Theactualaverage salary is 2159.00

The resulting error between the two calculations is 2159.00 - 98.00 = 2061.00 which, when rounded to the next integer, is. 2061

풀이

SELECT CEIL(AVG(Salary) - AVG(REPLACE(Salary, 0, ''))) FROM EMPLOYEES