Our Source Database

For both queries assume that the source database is the following:

             |
             | DB
             |
             o
            /|\ 
           / | \ 
        P /  |P \ P
         /   |   \ 
        / F  | F  \ 
       o<----o---->o 
       |     |     |
    Age|  Age|     |Age
       |     |     |
       17   14     11