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-- ÔÚÏòÖ¸¶¨ÈÕÆÚ¼ÓÉÏÒ»¶Îʱ¼äµÄ»ù´¡ÉÏ£¬·µ»ØÐ嵀 datetime Öµ
¼ÓÄê·Ý——print dateadd(year, 5, getdate())       ¼ÓÔ·ݗ—print dateadd(month, 5, getdate())
¼ÓÌìÊý——print dateadd(day, 5, getdate())    ¼ÓСʱ——print dateadd(hour, 5, getdate())
¼Ó·ÖÖÓ——print dateadd(mi, 5, getdate())     ¼ÓÃëÊý——print dateadd(ss, 5, getdate())


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