title: Create columns in table from list
body: <p>How can I create multiple columns in a table from a list?</p>
  
  <p>table name: <strong>teachers</strong></p>
  
  <p>column names list:</p>
  
  <pre><code>first_name
  last_name
  email
  phone
  age
  birthday
  school
  district
  subject
  ...
  ...
  ...
  </code></pre>
  
  <p>how can I create those columns with <code>VARCHAR (20)</code> all <strong><code>null</code></strong> in my table?</p>