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select max(a) as b from c where id='d'

C# code:
select max(a) as b from c where id='d'

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DataSet
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select isnull(max(a),0) as b from c where id='d'
if(ds.Tables[0].Rows.Count>0)
{

}
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  if(????==null)
{


}

command.ExecuteScaler()

try
{
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}
catch
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}

C# code:
if(ds.Tables[0].Rows["b"]==null || ds.Tables[0].Rows["b"]==string.Empty)
{
...
}


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