I'm attempting to write some SQL code in Oracle 10g to pull data from a tree structure. Basically, I have a users table, and each user is assigned to a manager. (The user's manager's ID is kept in the manager field of the user's entry in the users table.) From this tree structure, I want to pull a list of all users who report either directly or indirectly to a particular division head (top level manager). I imagine that this query would involve...