No fue divertido leer tu consulta, pero creo que el problema está aquí:
LEFT JOIN (
SELECT max(notification_date) notification_date, client_id
FROM og_ratings
WHERE notification_date NOT IN (
SELECT max(notification_date)
FROM og_ratings
)
si desea la fecha máxima para cada cliente, necesita GROUP BY client_id:
SELECT client_id, max(notification_date) notification_date
FROM og_ratings
GROUP BY client_id
si desea el segundo máximo, hay pocas opciones, estoy usando esta que es más fácil de entender pero no es necesariamente la más eficaz:
SELECT client_id, max(notification_date) notification_date
FROM og_ratings
WHERE
(client_id, notification_date) NOT IN (
SELECT client_id, max(notification_date)
FROM og_ratings GROUP BY client_id
)
GROUP BY client_id
tercer problema, está utilizando LEFT JOIN, lo que significa que devolverá todos los valores de og_ratings, independientemente de si son el segundo máximo o no. Use INNER JOIN en este contexto:
SELECT
r.client_id,
c.id,
t.id,
..etc...
FROM
og_ratings r INNER JOIN (
SELECT client_id, max(notification_date) notification_2nd_date
FROM og_ratings
WHERE
(client_id, notification_date) NOT IN (
SELECT client_id, max(notification_date)
FROM og_ratings GROUP BY client_id
)
GROUP BY client_id
) r2
ON r.notification_date = r2.notification_2nd_date
AND r.client_id = r2.client_id
LEFT JOIN og_companies c ON r.client_id = c.id
LEFT JOIN og_rating_types t ON r.rating_type_id = t.id
LEFT JOIN og_actions a ON r.pacra_action = a.id
LEFT JOIN og_outlooks o ON r.pacra_outlook = o.id
LEFT JOIN og_lterms l ON r.pacra_lterm = l.id
LEFT JOIN og_sterms s ON r.pacra_sterm = s.id
LEFT JOIN pacra_client_opinion_relations pr ON pr.opinion_id = c.id
LEFT JOIN pacra_clients pc ON pc.id = pr.client_id
LEFT JOIN city ON city.id = pc.head_office_id
WHERE
r.client_id IN (
SELECT opinion_id FROM pacra_client_opinion_relations
WHERE client_id = 50
)
