SELECT s.nome, AVG(f.salario) as media FROM FUNCIONARIO AS f INNER JOIN SETOR AS s GROUP BY s.nome

SELECT s.nome, AVG(f.salario) as media FROM FUNCIONARIO AS f INNER JOIN SETOR AS s ON f.matricula = s.codigo GOUP BY s.nome

SELECT s.nome, AVG(f.salario) as media FROM FUNCIONARIO AS f INNER JOIN SETOR AS s ON f.setor = s.codigo GROUP BY s.nome

SELECT s.nome, AVG(f.salario) as media FROM FUNCIONARIO AS f, SETOR AS s WHERE f.codigo = s.codigo