Using the distinct function in SQL

Question

I have a SQL query I am running. What I was wanting to know is that is there a way of selecting the rows in a table where the value in on one of those columns is distinct? When

Answer 1

declare @temp as table (colA nchar, colB nchar, colC nchar, colD nchar, rownum int)

insert @temp (colA, colB, colC, colD, rownum)
select Test.ColA, Test.ColB, Test.ColC, Test.ColD, ROW_NUMBER() over (order by ColA) as rownum
    from Test

select t1.ColA, ColB, ColC, ColD
from @temp as t1
join (
    select ColA, MIN(rownum) [min]
    from @temp
    group by Cola)
 as t2 on t1.Cola = t2.Cola and t1.rownum = t2.[min]

This will return a single row for each value of the colA.