Consider a database schema with a relation Emp whose attributes are as shown below, with types specified for multivalued attributes. Emp = (ename, ChildrenSet multiset(Children), SkillSet multiset(Skills)) Children = (name, birthday) Skills = (type, ExamSet setof(Exams)) Exams = (year, city)

Redesign the database into a relational database holding the first normal form and the fourth normal form. List any functional or multivalued dependencies that you assume. Also, list all referential-integrity constraints that should be present in the first and fourth normal form schemas.