Thales Ground Master radar systems record signal readings from monitored tracks. Write a PostgreSQL query that returns the readings sorted by signal strength from the lowest value to the highest value.
sensor_id, radar_name, and signal_strength from radar_readings.signal_strength in ascending order, place NULL values after known readings, and use sensor_id as a tie-breaker.| Column | Type | Description |
|---|---|---|
| sensor_idPK | INT | Unique identifier for the radar reading |
| radar_name | VARCHAR(100) | Name of the Ground Master radar station |
| signal_strength | NUMERIC(6,2) | Recorded signal strength, which may be unknown |
| recorded_at | TIMESTAMP | Timestamp when the reading was captured |