title: Extending tables in SQL
body: <p>How to add a column to the table:</p>
  
  <pre><code>create table table1 (id integer primary key, field1 text)
  </code></pre>
  
  <p>? The column would be <code>field2 text</code> and the value for existing rows in this column should be <code>value</code>.</p>