**Runners**
| Id | Name |
| -- | -----|
| 1 | Jhon Doe |
| 2 | Jane Morton |
| 3 | Alice Smith |
| 4 | Dave Jones |
| 5 | Lisa Gomez |

**Races**
| Id | Event | Winner_Id |
| -- | -------------- | --------- |
| 1 | 100 meter dash | 2 |
| 2 | 500 meter dash | 2 |
| 3 | cross-country | 2 |
| 4 | triathlon | NULL |

1. Get all runners that won 500 meter dash events
2. Get all runners which their names start with 'J'