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SELECT CEILING(AVG(sal.actual - sal.fake)) AS blunder
FROM (
SELECT
CEILING(SALARY) AS actual,
ROUND(CEILING(CAST(REPLACE(SALARY, '0', '') AS UNSIGNED))) AS fake
FROM EMPLOYEES
) AS sal;
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The Blunder
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SELECT CEILING(AVG(sal.actual - sal.fake)) AS blunder FROM ( SELECT CEILING(SALARY) AS actual, ROUND(CEILING(CAST(REPLACE(SALARY, '0', '') AS UNSIGNED))) AS fake FROM EMPLOYEES ) AS sal;