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Indeed, I got: 2252.25 and it's the actual answer:
SELECT ((AVG(ACTUAL_SALARY)) - (AVG(WRONG_SALARY)))
FROM
(
SELECT TO_NUMBER(REPLACE(TO_CHAR(SALARY),'0', '')) AS WRONG_SALARY, SALARY AS ACTUAL_SALARY FROM EMPLOYEES
);
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The Blunder
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Indeed, I got: 2252.25 and it's the actual answer: SELECT ((AVG(ACTUAL_SALARY)) - (AVG(WRONG_SALARY))) FROM ( SELECT TO_NUMBER(REPLACE(TO_CHAR(SALARY),'0', '')) AS WRONG_SALARY, SALARY AS ACTUAL_SALARY FROM EMPLOYEES );