query: SELECT Citizenship ,  max(Net_Worth_Millions) FROM singer GROUP BY Citizenship
question: For each citizenship, what the maximum net worth?
query_toks: SELECT Citizenship , max ( Net_Worth_Millions ) FROM singer GROUP BY Citizenship
query_toks_no_value: select citizenship , max ( net_worth_millions ) from singer group by citizenship
question_toks: For each citizenship, what the maximum net worth?