Write a SQL query to show each order with a running total of amounts.
| id | order_date | amount | running_total | |----|------------|--------|---------------| | 1 | 2023-01-20 | 76500.0 | 76500.0 | | 2 | 2023-01-25 | 8850.0 | 85350.0 | | 3 | 2023-02-01 | 4500.0 | 89850.0 | | ... | ... | ... | ... |