Question: I need help understanding the join cost and the total cost on this diagram. A few things I need clarity on . Why is the

I need help understanding the join cost and the total cost on this diagram. A few things I need clarity on. Why is the data on the joins scanned and stored in Temp 1 and Temp 2? If Sailor has 500 pages, why now is 250? In the total cost where is that 1000+10 coming from and where is coming from 500+250? Please explain very detailed to understand.
I need help understanding the join cost and the total cost

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