How to make an optimal hibernate query with three objects?

I have a query but I don't know how to make it optimal. I have three objects.

• SCP
• Question : it has a field that points SCP (SCP_id)
• Answer : it has a field that points Question (question_id)

How can I make a query that counts the number of answer开发者_开发技巧 within a given SCP

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What about this:

select count(a) 
from Answer a 
where a.question.scp.id = :id

Which generates the following SQL:

select
  count(answer0_.id) as col_0_0_ 
 from
  Answer answer0_,
  Question question1_ 
 where
  answer0_.question_id=question1_.id 
  and question1_.scp_id=?

Seems pretty efficient.