Select from one table if no records found in another : <p>I have two tables:</p>

<pre><code>t1
------------
id
user


t2
------------
user_id
item
</code></pre>

<p>I need to select from t1 if no matching records found in t2</p>

<pre><code>SELECT * 
FROM t1
LEFT JOIN t2 ON (t1.id = t2.user_id)
WHERE ???
</code></pre>

<p>Kinda stuck...</p>
