SELECT c.First_Name AS "First Name", 
       c.Last_Name AS "Last Name", 
       a.Account_ID AS "Account ID"
FROM customer c
JOIN account a ON c.Customer_ID = a.Customer_ID
JOIN transaction t ON a.Account_ID = t.Account_ID
WHERE t.Amount > 30000;

SELECT Transaction_ID, Account_ID
FROM transaction
WHERE Transaction_Type = 'debit'
AND Amount > 45000;