Hi everyone,
I know this place is not to ask question like this. but I have one question about one topic. As you can see for e.g. its mentioned that age uses hash index. But in the a) part you see that make calculation with B+ tree. Why? I don't get it I did the calculation with hash index. I thought for equality search you use hash index`? Other question where does this purple calculation come from why is it needed?



