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alter table Skating_Consumption add MemberCardId numeric(9)
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update Skating_Consumption set MemberCardId='0'
go
ALTER TABLE Skating_Consumption ALTER COLUMN
MemberCardId numeric(9) not null


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import pymssql

#connect database
conn=pymssql.connect(host="192.168.1.28",user="boomink",password="boomink",
database="boomink")

cur=conn.cursor()

print '========================================'

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DATEDIFF(datepart,   startdate,   enddate)  
   
  Datepart   Abbreviations    
  year   yy,   yyyy    
  quarter   qq,   q    
  month   mm,   m    
......
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