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Flat file to sql server problem

Posted By:      Posted Date: October 01, 2010    Points: 0   Category :Sql Server

i m importing one flat file to sql server ...in that flat file one column is showing as string ..whn i m importing to sql server i m taking it as nvarchar...Data is ok ..

But whn i do some actions like sum ..if there is null in sql server it is show as  value+null as valuenull...(it is taking null as string not as null into sql server)

sample data

col1               Col2

234445         null


output like (when do sum)



How to proceed for this.


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