How would you use Python and SQL together to prepare data for analysis?
Use SQL to return analysis-ready market observations, then describe how Python would consume and validate the result. Include only records with a non-empty security identifier, a positive closing price, and a nonnegative volume.
observation_date, security_id, closing_price, volume, and source_system.unknown and order by observation date, then security identifier.| Column | Type | Description |
|---|---|---|
| observation_idPK | INT | Unique observation identifier |
| observation_date | DATE | Date associated with the observation |
| security_id | VARCHAR(30) | Identifier for the observed security |
| closing_price | DECIMAL(10,2) | Closing price for the observation |
| volume | INT | Reported trading volume |
| source_system | VARCHAR(30) | System that supplied the observation |