Find the total checking and saving balance of all accounts sorted by the total balance in ascending order.
SELECT T1.balance + T2.balance FROM checking AS T1 JOIN savings AS T2 ON T1.custid  =  T2.custid ORDER BY T1.balance + T2.balance
total checking and saving balance refers to SUM(T1.balance + T2.balance); sorted by total balance in ascending order refers to ORDER BY SUM(T1.balance + T2.balance) ASC;