: Verify that the rental data is normalized (e.g., separate tables for Klienci (Customers), Obiekty (Properties/Items), and Wynajmy (Rentals)). Ensure there is no redundant storage of rental rates in the transaction table if they can be retrieved via a JOIN from the primary item table .
This review evaluates the script for schema integrity, query efficiency, and adherence to SQL development standards .
: Check for NOT NULL constraints on essential fields (dates, IDs) and CHECK constraints to ensure rental start dates are always before end dates. 2. Code Quality & Formatting wynajem.sql
: Use explicit INNER JOIN or LEFT JOIN syntax rather than comma-separated tables in the WHERE clause for better readability and maintenance . 4. Safety & Transactions
: Add inline comments ( -- ) or block comments ( /* ... */ ) to explain complex logic, such as how tax is calculated or how "available" status is determined. : Verify that the rental data is normalized (e
: Use CREATE TABLE IF NOT EXISTS or DROP TABLE IF EXISTS to ensure the script can be run multiple times without errors.
: Use descriptive aliases for tables (e.g., FROM Wynajmy AS w ) instead of single letters to improve clarity in multi-table joins. 3. Performance & Optimization : Check for NOT NULL constraints on essential
: Ensure that currency fields (e.g., cena , kaucja ) use precise types like DECIMAL or NUMERIC rather than floating-point types to avoid rounding errors.