How to build a sql query to return avg(price), min(price), max(price) joined with avg(order), min(order), max(order)?

I think what you need is a full outer join since rows could be in either one table or the other or both.

Your queries don't make a whole lot of sense, so there's a lot I had to attempt to infer from your question. It's always better to post the create table scripts and some sample data (as well as the desired output) when asking SQL questions.

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