title: Addition with NULL values across multiple columns
body: <pre><code>Col1    Col2    Col3    SumCol
    4       9     NULL      13
  NULL      8       2       10
    8       3     NULL      11
  NULL      5       5       10
  </code></pre>
  <p>I have a table populated with columns Col1, Col2, and Col3, and I am trying to create a new column, SumCol. I know addition with NULL values is annoying so I appreciate any help</p>