Comment by deadfa11

> What singer sang in the most stadiums?

    SELECT singer.Name FROM singer JOIN singer_in_concert ON singer.Singer_ID = singer_in_concert.Singer_ID GROUP BY singer.Singer_ID ORDER BY COUNT(*) DESC LIMIT 1

It is close... sort of? It figured out it needed to join, group, and order, but it only drew the relation to the concert, not the venue. Correctness seems a huge challenge here. Even knowing SQL, I feel I'm double checking my results at times. But I can see how this might be incredibly useful someday for Salesforce if there's confidence in the results.