I didn't need to learn a whole lot last week, but two useful items are MySQL's group_concat function and how to change the admin
Change Mac admin password without the disk Very useful when employees leave and their password doesn't appear to work.
MySQL's Group Concat Function I love this function! If you ever need to pull back a list of anything, e.g. table ids, this will put them all into one column, separated by a comma or whatever you specify.
SELECT GROUP_CONCAT(id) FROM authors;