Select Statement to Get Unique values in a Column

I am trying to figure out how to get all the unique values from a
table column?
select code from atable sort unique?
I am running 8.1.7
Does anyone know how to do this?
Thanks,

Hi,
Here is the code for that.
Select empno from emp
group by empno
having count(empno) = 1
Regards,
Ganesh R

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          1000                  7
          1001                  6
          1002                  1

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