What are the names of customers with checking balances lower than the average checking balance?
SELECT T1.name FROM accounts AS T1 JOIN checking AS T2 ON T1.custid  =  T2.custid WHERE T2.balance  <  (SELECT avg(balance) FROM checking)
Ortalama kontrol bakiyesinden daha düşük dengeleri kontrol eden müşterilerin adları nelerdir?