You won't get the two queries to JOIN in the way that you are attempting to, unless each query works in isolation. The second query has aggregate functions but there's no GROUP BY, it's associated with the outer query. If all you want from the second query is those aggregate columns then there's almost certainly a better way of doing this. Can you give us some more detail?
For fast, accurate and documented assistance in answering your questions, please read this article.
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