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why sql always return 0 on empty columns?

Posted By:      Posted Date: April 10, 2011    Points: 0   Category :ASP.Net

the condition is IF 0 then show empty string
I was expectd the result would be

from sheet

sdate                                edate                           dd     hh
2011/03/17 09:00:00        2011/03/17 17:00:00      1       0
2011/03/16 13:00:00        2011/03/16 13:00:00      21     0
2011/03/31 09:00:00        2011/03/31 13:00:00      0      4

I am just wondering why it return 0 instead of the empty string I set

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