Solution

[just-oleh]

No description provided.

[mateacademy-ai-mentor]

Review Summary

Your solution is approved because the task.sql script correctly drops and recreates ShopDB, defines a properly normalized schema (Countries, Warehouses, Products, ProductInventory), and updates all INSERT statements to match the new structure while enforcing referential integrity with foreign keys. The core requirements—moving to third normal form and ensuring the data model is split into logical entities—are clearly met, and nothing in the current design should block the provided tests from running successfully. As an improvement for data integrity, consider adjusting the CREATE TABLE ProductInventory section (where you define ProductInventoryID as the primary key) to either use a composite primary key or a UNIQUE (ProductID, WarehouseID) constraint so that the same product cannot appear multiple times in the same warehouse. It would also be good practice to mark all primary and foreign key columns as NOT NULL and optionally add AUTO_INCREMENT to ID columns to simplify inserts. For performance and maintainability, you might later add indexes on foreign key columns and review whether ON DELETE behaviors like CASCADE or RESTRICT better express your intended business rules, and double-check the minor product name typo in your insert data. Overall, solid work on the normalization and schema design—these refinements would just make your database more robust in real-world scenarios.

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