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DATEDIFF(datepart,   startdate,   enddate)  
   
  Datepart   Abbreviations    
  year   yy,   yyyy    
  quarter   qq,   q    
  month   mm,   m    
  dayofyear   dy,   y    
  day   dd,   d    
  week   wk,   ww    
  hour   hh    
  minute   mi,   n    
  second   ss,   s    
  millisecond   ms


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