sql-query distinct entries

I need a little help with the following problem:

I would like to have a result set containing all entries of one table that are not distinct. e.g.:

SELECT DISTINCT value FROM table

value
-------
abc
def
ghi

SELECT value FROM table

value
-------
abc
abc
def
ghi
ghi

What I need is a statement that returns
something like this:

value
-------
abc
ghi


Any ideas?
Thanks!

select value, count(*)
from table
group by value
having count(*) > 1

Thanks, that does the job!
Chris.