Database: financial
Question: For the client who applied the biggest loan, what was his/her first amount of transaction after opened the account?
SQL: SELECT T3.amount FROM loan AS T1 INNER JOIN account AS T2 ON T1.account_id = T2.account_id INNER JOIN trans AS T3 ON T2.account_id = T3.account_id ORDER BY T1.amount DESC, T3.date ASC LIMIT 1