SELECT p.*, g.good_name FROM Payments p JOIN Goods g ON p.good = g.good_id WHERE p.unit_price > 1000;

This SQL query selects all fields from the Payments table (aliased as p) and the good_name field from the Goods table (g), joining them on the condition that the good field in Payments matches the good_id in Goods. It filters only records where the unit_price in Payments is greater than 1000.

For QA, it is important to understand that this query:

• Uses INNER JOIN, meaning only payments with a corresponding product will be selected.
• Filtering by unit_price > 1000 helps verify the correctness of filters and joins.

During testing, you can check:

• The correctness of data merging (e.g., that good_name matches the correct product).
• The accuracy of the price filter.
• Handling cases where Payments records do not have a corresponding product (these will not appear in the result).

Testing with sample data can help ensure the query's correctness.