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day() Ìì »òdayofmonth Òâ˼ÊÇÄÃÔÂÀ´ËµµÄÌìÊý
dayofyear() ÄÃÄêÀ´ËµµÄÌì
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interval(¼ä¸ôµÄÒâ˼) date_add ʱ¼äÏà¼ÓµÄº¯Êý
interval Êý×Ö year»òÕßmonth
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