9. Think of an additional query, write the query, and share the query on the discussion board 10. Try to write the Relational algebra expression for your query 11. Try to write the Relational algebra expression for one of the queries on the course Discussion board that was posted by another student. Consider the following table definition, where the primary keys are underlined. Give an expression in relational algebra for each of the following queries. Athlete (aID integer, aName string, ranking integer, age integer) Event (eID string, eName string, eLocation string) Competes (aID integer, eID string, sport string, year integer)