[MySQL/HackerRank] The Blunder (+ Ceil, Convert, Cast 함수)
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SQL/HackerRank
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.: ave..