7. Given the E-R diagram shown below, give a database schema (ie. list of relations) for it. The keys of each entity are shown in quotes, Research Assistant is a weak entity. Projects is a multivalued attribute inres Double lines mean total participation; single line, partial participation. Make sure to give the keys for each relation (primary and foreign). ssn Chairs dname salary building M WorksDepartmentaddress ProfessorW number paame date-sta campus or Offersemester Teaches cname Research Assistant age Course level credits