HW 4, what points taken off for, etc.

-1 for not turning the hw in using the correct directory.

For #2 and #3, full credit if what you gave was reasonable-ish.
-.5 if it looks like you have an error in your commands, meaning you didn't
actually run them on your mysql.  

For #4, points taken off if it seems you didn't really look in the book for what 
topic would be interesting.

I left some comments in some of your files.  Search for "Jeff says".