ORACLE JOIN TABLES : <p>I have </p>

<pre><code>T1: USER_ID OSX
       1     Y
       2     Y  

T2: USER_ID ANDROID
       1     Y
       3     Y  
</code></pre>

<p>I want to join the tables as follows but i don't know how</p>

<pre><code>T3: USER_ID ANDROID  OSX
       1     Y        Y
       2     null     Y
       3     Y        null
</code></pre>
