How would you optimize a slow SQL query in a Samsara data pipeline?
Assume the query reads from event and device tables and must return the latest valid event per device for a reporting job. Keep the answer focused on how you would improve the SQL and why.
device_id, event_time, event_type, location_iddevice_id ascending| Column | Type | Description |
|---|---|---|
| device_idPK | BIGINT | Unique device identifier |
| serial_number | VARCHAR(64) | Device serial number |
| is_active | BOOLEAN | Whether the device is active |
| region | VARCHAR(32) | Device region |
| Column | Type | Description |
|---|---|---|
| event_idPK | BIGINT | Unique event identifier |
| device_id | BIGINT | Device that generated the event |
| event_time | TIMESTAMP | Event timestamp |
| event_type | VARCHAR(32) | Type of event |
| location_id | BIGINT | Associated location identifier |
| is_valid | BOOLEAN | Whether the event is valid for reporting |