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SELECT Name, YEAR(GETDATE() - Birthday) - 1899 AS Age FROM dbus
string str = @"select name, datediff(year,getdate(),age) as age from dbus ";
private int YearSpan()
{
DateTime DS='1981-12-23 ' ;
DateTime DE='2009-1-13' ;//Now
return (DE.Year - DS.Year);
}