SQL不是程序员的专利，Excel用户只需掌握5个核心语句（SELECT、FROM、WHERE、GROUP BY、ORDER BY）就能解决80%办公场景问题。代码不是用来背的，而是用来替代重复劳动的。

THEN(TIMESTAMPDIFF (HOUR, check_in, check_out) -8) *15-- 超出8小时部分1.5倍时薪 ...

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