Select unique values from the same column in two tables
<p>I'm just playing with SQL and want to achieve the following result
I have the following tables:</p>

<pre><code>TABLE_1   ID   NAME
          1    CAR
          2    ANIMAL
          5    ROCK

TABLE_2   ID   NAME
          1    GRASS
          2    ROCKET
          3    STONE
          4    DOG
</code></pre>

<p>I want my query to return unique ID values from both tables:</p>

<pre><code>ID
3
4
5
</code></pre>

<p>I have tried using DISTINCT and FULL OUTER JOINS, but without success.
Any help would be appreciated.</p>