title: postgresql - exclude any result with nulls
body: <p>I'm doing a bunch of sum queries: <code>SELECT col1 + col2 + col3 + ...</code></p>
  
  <p>Some of the values in some of the columns are null.  I'm checking for them by doing</p>
  
  <pre><code>SELECT CASE WHEN col1 is not null and col2 is not null and ...
  </code></pre>
  
  <p>I'm wondering if there is a more concise syntax for accomplishing this task.</p>