Discover the differences between Drupal updates vs upgrades vs migrations with our guide. Determine when and why you may need each one to keep your site running smoothly and securely.
Drupal Update
When you upgrade from Drupal 5 to Drupal 6 you might run into the following error if the upgrade was not properly done
Warning: Unknown column 'serialized' in 'field list' query: SELECT data, created, headers, expire, serialized FROM cache WHERE cid = 'variables' in [drupal 6 "/includes/database.mysqli.inc" file] on line 128
There could be several reasons why the error happened but there is a simple solution to solving this problem.