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        select getdate()
2. dateadd      ÔÚÏòÖ¸¶¨ÈÕÆÚ¼ÓÉÏÒ»¶Îʱ¼äµÄ»ù´¡ÉÏ£¬·µ»ØÐ嵀 datetime Öµ
       ÀýÈ磺ÏòÈÕÆÚ¼ÓÉÏ2Ìì
       select dateadd(day,2,'2004-10-15')      --·µ»Ø£º2004-10-17 00:00:00.000
3. datediff ·µ»Ø¿çÁ½¸öÖ¸¶¨ÈÕÆÚµÄÈÕÆÚºÍʱ¼ä±ß½çÊý¡£
       select datediff(day,'2004-09-01','2004-09-18')       --·µ»Ø£º17
       select datediff(day,'2004-09-18','2004-09-01')       --·µ»Ø£º-17
4. datepart ·µ»Ø´ú±íÖ¸¶¨ÈÕÆÚµÄÖ¸¶¨ÈÕÆÚ²¿·ÖµÄÕûÊý¡£
      SELECT DATEPART(month, '2004-10-15')      --·µ»Ø 10
5. datename ·µ»Ø´ú±íÖ¸¶¨ÈÕÆÚµÄÖ¸¶¨ÈÕÆÚ²¿·ÖµÄ×Ö·û´®
       SELECT datename(weekday, '2004-10-15')      --·µ»Ø£ºÐÇÆÚÎå
6. day(), month(),year() --¿ÉÒÔÓëdatepart¶ÔÕÕÒ»ÏÂ
select µ±Ç°ÈÕÆÚ=convert(varchar(10),getdate(),120)
,µ±Ç°Ê±¼ä=convert(varchar(8),getdate(),114)
select datename(dw,'2004-10-15')
select ±¾ÄêµÚ¶àÉÙÖÜ=datename(week,'2004-10-15')
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date2-date1
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