Hacker Rank SQL

The Blunder Solution

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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 zeros 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:

Column Type
ID Integer
Name String
Salary Integer

Note: Salary is per month.


  • 1000 < Salary < 10^5

Sample Input

Id Name Salary
1 Kristeen 1420
2 Ashley 2006
3 Julia 2210
4 Maria 3000

Sample Output



The table below shows the salaries without zeros as they were entered by Samantha:

Id Name Salary
1 Kristeen 142
2 Ashley 26
3 Julia 221
4 Maria 3

Samantha computes an average salary of 98.00. The actual average salary is 2159.00.

The resulting error between the two calculations is 2159.00 – 98.00 = 2061.00. Since it is equal to the integer 2061, it does not get rounded up.


Solution – The Blunder

MySQL Code
SELECT CEIL(AVG(Salary)-AVG(REPLACE(Salary,'0','')))



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