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1.  µ±Ç°ÏµÍ³ÈÕÆÚ¡¢Ê±¼ä
    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
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')
      ,½ñÌìÊÇÖܼ¸=datename(weekday,'2004-10-15')
 
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GetDate( )                                    ·µ»ØÏµÍ³Ä¿Ç°µÄÈÕÆÚÓëʱ¼ä
DateDiff (interval,date1,date2)               ÒÔinterval Ö¸¶¨µÄ·½Ê½£¬·µ»Ødate2 Óëdate1Á½¸öÈÕÆÚÖ®¼äµÄ²îÖµ date2-date1
DateAdd (interval,number,date)                ÒÔintervalÖ¸¶¨µÄ·½Ê½£¬¼ÓÉÏnumberÖ®ºóµÄÈÕÆÚ
DatePart (interval,date)                   &n


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