Vous pouvez UNION ALL les requêtes séparées et appliquer conditionnel agrégation sur l'ensemble résultant :
select score,
max(case when type = 'satisfaction' then count end) as satisfaction_count,
max(case when type = 'response' then count end) as response_count,
max(case when type = 'responder' then count end) as responder_count,
max(case when type = 'service' then count end) as service_count
from (
select satisfaction_score as score,
count(satisfaction_score) as count,
'satisfaction' as type
from j_survey_response
where satisfaction_score != 0
group by satisfaction_score
union all
select response_score,
count(response_score) as count, 'response' as type
from j_survey_response
where response_score != 0
group by response_score
union all
select responder_score,
count(responder_score) as count, 'responder' as type
from j_survey_response
where responder_score != 0
group by responder_score
union all
select service_score,
count(service_score) as count, 'service' as type
from j_survey_response
where service_score != 0
group by service_score) as t
group by score
