One OSTraining member told us that they had a database error on their site.

Here's the error that was showing:

PDOException: SQLSTATE[42S02]: Base table or view not found: 1146 Table 'cache_rules' doesn't exist

Fortunately, a solution was provided on the Drupal forums. However, the solution was an update to the database, and our member wanted some advice on how to run that update.