Multi table assignment

There are four tables that Oracle used: emp, dept, bonus and salgrade. They are available in many places on the web. One site is: Set of Oracle tables

1. Write, run and explain a query using an equijoin.
2. Write, run and explain a query using an outerjoin.
3. Write, run and explain a pairwise comparison.
4. Write, run and explain a non pairwise comparison.
5. Write, run and explain linking three tables using join.