SELECT A.NOME, AVG(H.NOTA)
FROM ALUNO A
RIGHT OUTER JOIN HISTORICO H
ON A.MATRIC=H.MATRIC
GROUP BY A.NOME

SELECT A.NOME, AVG(H.NOTA)
FROM ALUNO A
INNER JOIN HISTORICO H
ON A.MATRIC=H.MATRIC
GROUP BY A.NOME

SELECT A.NOME, AVG(H.NOTA)
FROM ALUNO A, HISTORICO H
WHERE A.MATRIC=H.MATRIC
GROUP BY A.NOME

SELECT A.NOME, AVG(H.NOTA)
FROM ALUNO A
LEFT OUTER JOIN HISTORICO H
ON A.MATRIC=H.MATRIC
GROUP BY A.NOME

SELECT A.NOME, AVG(H.NOTA)
FROM ALUNO A
RIGHT OUTER JOIN HISTORICO H
ON A.MATRIC=H.MATRIC
GROUP BY A.MATRIC