Show all transaction ids with transaction code 'PUR'.
SELECT transaction_id FROM TRANSACTIONS WHERE transaction_type_code  =  'PUR'
SELECT transaction_id FROM TRANSACTIONS WHERE transaction_type_code  =  'PUR'
[{'transaction_id': 2}, {'transaction_id': 4}, {'transaction_id': 5}, {'transaction_id': 6}, {'transaction_id': 7}, {'transaction_id': 9}, {'transaction_id': 14}, {'transaction_id': 15}]