title: Add auto-computed column in SQL
body: <p>I'm trying to add an auto-computed column in my SQL table, which should be easy enough. However, I keep getting an error message saying there's something wrong with the syntax beginning with the word "AS" in the input below:</p>
  
  <pre><code>ALTER TABLE users ADD column_1 AS numerator / denominator;
  </code></pre>
  
  <p>The table "users" already exists, as do the columns "numerator" and "denominator". Any ideas?</p>