| id | name |
|---|---|
| 1 | USA |
| 2 | UK |
| id | central_bank_name | country_id |
|---|---|---|
| (→ Country.id) | ||
| 1 | Federal Reserve | 1 |
| 2 | Bank of England | 2 |
| id | commercial_bank_name | country_id |
|---|---|---|
| (→ Country.id) | ||
| 1 | Citibank | 1 |
| 2 | Barclays | 2 |
| id | account_number | balance | commercial_bank_id |
|---|---|---|---|
| (→ Commercial_Bank.id) | |||
| 1 | 123456789 | 0 | 1 |
| 2 | 987654321 | 0 | 2 |