MYSQL LEFT JOIN ON RELATED TABLE - mysql

Question

I have 4 tables and a SQL which is returning almost what I want. It envolves max dates with related tables and a intermediate table. Last question was answered, but I realized I needed more in sql, which is returning null if there's no record in related tables for the id_aluno foreign key.
table: Aluno
id_aluno nome
1 Bruno
2 Carlos
3 Fernando
table: Serie
id_serie id_aluno descricao
1 1 Tipo A
2 1 Tipo B
3 2 Tipo A
table: Treino
id_treino id_serie data
1 1 2015-12-10
2 2 2015-12-12
3 3 2015-12-10
table: Avaliacao
id_avaliacao id_aluno data_avaliacao
1 1 2015-12-07
2 1 2015-12-01
3 2 2015-12-05
4 2 2015-12-04
I want the following results:
nome descricao data data_avaliacao
Bruno TIPO B 2015-12-12 2015-12-07
Carlos TIPO A 2015-12-10 2015-12-05
Fernando null null null
But the following SQL doesn't returns me a "aluno" (a.nome) if there is no data on related tables. I tried LEFT JOIN, but it's not the way I want.
SELECT a.nome, s.descricao, t.data, v.data_avaliacao
FROM aluno a
JOIN serie s
ON s.id_aluno = a.id_aluno
JOIN treino t
ON t.id_serie = s.id_serie
JOIN
( SELECT s.id_aluno
, MAX(t.data) max_data
FROM serie s
JOIN treino t
ON t.id_serie = s.id_serie
GROUP
BY id_aluno
) x
ON x.id_aluno = s.id_aluno
AND x.max_data = t.data
JOIN avaliacao v
ON s.id_aluno = v.id_aluno
WHERE v.data_avaliacao IN
( SELECT MAX(v.data_avaliacao) max_data1
FROM avaliacao v
GROUP
BY id_aluno
)
I hope you can help. Thank you

Answer 1

Try something like this
SELECT nome,
descricao,
data,
data_avaliacao
FROM aluno A
LEFT OUTER JOIN serie S
ON A.id_aluno = S.id_aluno
LEFT OUTER JOIN (SELECT s.id_aluno,
Max(t.data) data
FROM serie s
JOIN treino t
ON t.id_serie = s.id_serie
GROUP BY id_aluno) T
ON T.id_aluno = A.id_aluno
LEFT OUTER JOIN (SELECT Max(v.data_avaliacao) data_avaliacao,
id_aluno
FROM avaliacao v
GROUP BY id_aluno) V
ON v.id_aluno = A.id_aluno

Answer 2

I got it!
SELECT nome, T.descricao, T.data, data_avaliacao
FROM aluno A
LEFT OUTER JOIN (SELECT s.id_aluno, s.descricao, max(t.data) data
FROM serie s
JOIN treino t ON t.id_serie = s.id_serie
GROUP BY id_aluno) T ON T.id_aluno = A.id_aluno AND A.id_aluno = T.id_aluno
LEFT OUTER JOIN (SELECT max(v.data_avaliacao) data_avaliacao, id_aluno
FROM avaliacao_aluno v
GROUP BY id_aluno) V ON v.id_aluno = A.id_aluno