Hmm most incompetent co-worker? That would be the guy with a degree in IT who couldn't create a stored procedure without needing a team leader to tell him which keys to press. We were not his first employer and allegedly he had experience...

Perhaps this would be fine, learning curve and all that, for the first few weeks but when a simple select statement was still causing problems alarm bells rang loud. He got attached to the test team for a week before being sat down with the boss....