title: SQL sum of 3 columns
body: <p>I know this question might seem a little basic stuff but I want to make sure I get the right syntax because this line of code will run often:</p>
  
  <p>I want to <strong>sum columns A, B and C of table "alphabet" for all rows which have an id included in my IN clause</strong>.</p>
  
  <p>This is how I would do it but I'd like a confirmation if possible:</p>
  
  <pre><code>SELECT SUM(A + B + C) as "subtotal" FROM alphabet WHERE id IN ('1','5','378');
  </code></pre>