You are viewing a single comment's thread. Return to all comments →
I struggled with this too. And I didn't understand the other people's explinations. But, I worked it out my self finally! If you don't include this you'll get the minimum for all of the rows! But including it, gets the minimum for groups that match in both power and age. It does seem like there should be a more intuitive way of doing this, such as usinging group by.
Thank you for the explanation. I think the description of the question let us confused. It is not hard, but the confusion of the question description consumes time.