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どちらがより正しいですか?

SQL:

select datediff(HOUR, '2013-01-01 00:00:00 AM','2013-12-31 11:59:59 PM') = 8759

Google: https://www.google.com/search?q=hours+ina+year&oq=hours+in+a+year = 8765.81

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