title: DISTRIBUTE BY notices in Greenplum
body: <p>Say I run the following query on psql:</p>
  
  <pre><code>&gt; select a.c1, b.c2 into temp_table from db.A as a inner join db.B as b 
  &gt; on a.x = b.x limit 10;
  </code></pre>
  
  <p>I get the following message:</p>
  
  <blockquote>
    <p>NOTICE:  Table doesn't have 'DISTRIBUTED BY' clause --  Using
    column(s) named 'c1' as the Greenplum Database data distribution key
    for this table.<br>
    HINT:  The 'DISTRIBUTED BY' clause determines the
    distribution of data.   Make sure column(s) chosen are the optimal
    data distribution key to minimize skew.</p>
  </blockquote>
  
  <ol>
  <li>What is a <code>DISTRIBUTED BY</code> column? </li>
  <li>Where is <code>temp_table</code> stored? Is it stored on my client or on the server?</li>
  </ol>