Code the following queries in Relational Algebra (NOT SQL):

The following tables include information about tourists, their organizations, some organizations may have planned tours and information is kept about the tourists to participate in each tour; a tourist may work-for more than one organization. A tourist may participate in any tour whether organized by his/her organization or not. Each tourist has a city and a country where they live which may be different than their citizenship. Note that tid means tourist ID, code means tour code, org_name means organization name, sin_fd1 and sin_fd2 represent sin numbers of a person and his/her friend, citizenship is a country Tour(code, city, country, time, day) Participate(tid, code, class) Works-for(tid,org-name) Tourist(tid, sin, name, citizenship, city, country, age, gender) Organization(name, code, leader-tid, leader-sin, city, year_started) Friend(sin fdl, sin fd2) Code the following queries in Relational Algebra: d) For tourists who live in France, find the number of tourists who live in each city (in France) and their average age? e) Find the names of tourists who participated only in all the tour(s) in France? f) Find id's of tourists who have at least one friend who does not live in Ottawa and participated in a tour in Berlin organized by an organization in London