Retaining value for all pages of a thread?

[Robert9]

Let's assume I want to push the count of a user's posts in a thread into the thread's template. Then, I would need to query something like

"SELECT COUNT FROM post WHERE thread_id = AND user_id = ".

But what about pages 2, 3, 4, ...?

Do I want an extra query for each page? Does it make sense to cache this value? If so, where and how? If not, why not?
Retaining value for all pages of a thread?

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