Write SEVEN data retrieval SQL queries, and their
corresponding English description. Queries must exhibit
"interesting" SQL features that you learned in class (e.g.,
aggregates, sub-query, grouping and HAVING, various joins, set,
ANY/ALL/IN/EXIST, etc). If all your seven queries only use
simple features like simple projection or WHERE clause like a='b',
then you will not get full points.
At the end, show us: (1) query itself, and (2) answers returned from DB2. If NULL was returned, tell us so or populate mode data.