After Union Select Distinct

That's about it (subject line), I have used UNION and now I want to select DISCTINCT from that resultset
Code:

SELECT c1 FROM t1
UNION
SELECT c2 FROM t2

That code gives me half of what I want.
I would like a list of the unique results.
I know I could use a TempTable and do the DISTINCT on that, but I'm hoping there is a more elegant way.


EDIT: The following code gives me the result I want:
Code:

CREATE TABLE #TempTable (
TempCol VARCHAR (20) collate database_default,
)

INSERT INTO #TempTable
SELECT c1 FROM t1
UNION
SELECT c2 FROM t2

SELECT * FROM #TempTable

DROP TABLE #TempTable

. . . but, can it be done without a TempTable??