A SELECT c.nome, i.numero, AVG(cs.anomes) AS media FROM CLIENTE c INNER JOIN INSTALACAO i ON c.numero = i.cliente INNER JOIN CONSUMO cs ON i.numero = c.instalacao;
B SELECT c.nome, i.numero, SUM(cs.consumo) AS media FROM CLIENTE c INNER JOIN INSTALACAO i ON c.numero = i.cliente INNER JOIN CONSUMO cs ON i.numero = cs.instalacao GROUP BY c.nome, i.numero;
C SELECT c.nome, i.numero, AVG(cs.consumo) AS media FROM CLIENTE c INNER JOIN INSTALACAO i ON c.numero = i.cliente INNER JOIN CONSUMO cs ON i.numero = cs.instalacao GROUP BY c.nome, i.numero;
D SELECT c.cpf, i.numero, AVG(cs.consumo) AS media FROM CLIENTE c INNER JOIN INSTALACAO i ON c.numero = i.cliente INNER JOIN CONSUMO cs ON i.numero = cs.instalacao GROUP BY c.cpf, i.numero;