http://dev.mysql.com/doc/refman/5.5/en/date-and-time-functions.html#function_date-sub
日期差距：datediff(sysdate(),欄位)
時間差距：timediff(sysdate(),欄位)
時間差距，只看小時：time_format(timediff(sysdate(),欄位),'%H')
This man is too old to remember everything in his brain. Right now, he needs a place to write down what he has studied.
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