title: Alter MySQL table to add comments on columns
body: <p>I have been checking the <a href="http://dev.mysql.com/doc/refman/5.7/en/alter-table.html" rel="noreferrer">MySQL Documentation for ALTER TABLE</a> and it does not seem to include a way to add or modify a comment to a column. How can I do this?</p>
  
  <pre><code>-- for table
  ALTER TABLE myTable COMMENT 'Hello World'
  
  -- for columns
  -- ???
  </code></pre>