title: Check Column/Key Exists?
body: <p>I am running x-cart 4.23 and upgrading to 4.4 so I need to upgrade the database.</p>
  
  <p>Here is the error.  </p>
  
  <p><code>SQL error #1091 : Can't DROP 'PRIMARY'; check that column/key exists</code>
  <code>SQL query: ALTER TABLE xcart_customers DROP PRIMARY KEY</code></p>
  
  <p>The original error was this....</p>
  
  <p><code>SQL error #1075 : Incorrect table definition; there can be only one auto column and it must be defined as a key</code></p>
  
  <p><code>SQL query: ALTER TABLE xcart_customers DROP PRIMARY KEY</code></p>
  
  <p>When I cleared that I ran into that and have no idea where to start.</p>