title: how to set a column to be a primary key?
body: <p>I have this table in mysql database</p>
  
  <pre><code>number | username      | friendname   | location
  ------------------------------------------------------------
  1      | Nifa salem    |jack          | 47.117828 -88.545625
  2      | Flora         | fred         | 38.898556 -77.037852
  3      | Flora         | Nifa salem   | 32.9697 -96.80322
  4      | Flora         | Anne         | 29.46786, -98.53506
  </code></pre>
  
  <p>but it says this " This table does not contain a unique column. Grid edit, checkbox, Edit, Copy and Delete features are not available." 
  Now i need to set the number column to be the priamry key column! how can o do it! as i need to edit the data in this table.</p>