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SELECT CEIL(ABS(
(SELECT AVG(salary) FROM EMPLOYEES) -
(SELECT AVG(CAST(REPLACE(CAST(salary AS CHAR), '0', '') AS UNSIGNED)) FROM EMPLOYEES)
)) AS error_difference;
-- For MySQL
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The Blunder
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SELECT CEIL(ABS( (SELECT AVG(salary) FROM EMPLOYEES) - (SELECT AVG(CAST(REPLACE(CAST(salary AS CHAR), '0', '') AS UNSIGNED)) FROM EMPLOYEES) )) AS error_difference;
-- For MySQL