Review Summary

I am requesting changes because your schema does not yet match the required structure and this breaks the tests and core requirements. The primary key columns must be named exactly ID in all four tables; currently you use ProductsID, CustomersID, OrdersID, and OrderItemsID, which conflicts with the specification and causes lookups by ID to fail. Similarly, the foreign key columns must be named CustomerID in Orders, and OrderID/ProductID in OrderItems, but you currently use pluralized names like CustomersID, OrdersID, and ProductsID instead, which is why the tests report Unknown column 'CustomerID'. All foreign key constraints are also missing the required ON DELETE SET NULL clause (e.g. FOREIGN KEY (CustomerID) REFERENCES Customers(ID) ON DELETE SET NULL), so deletions will not behave as specified.

To fix this, rename all primary key columns to ID and adjust related foreign key columns to CustomerID, OrderID, and ProductID, then update each foreign key definition to include ON DELETE SET NULL and to reference the corrected column names. Your use of the correct database name, table presence, allowed data types, and AUTO_INCREMENT for primary keys is good, so once you align the names and foreign key behavior, your solution should fully meet the task requirements. Keep going—these are precise schema details, and getting them right is an important skill in database design.

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Review Summary

I am requesting changes because there are still critical schema errors that will prevent MySQL from creating your tables successfully. You correctly declared ID INT AUTO_INCREMENT in all tables, but every PRIMARY KEY clause still points to non‑existent columns (ProductsID, CustomersID, OrdersID, OrderItemsID), so you must change each one to PRIMARY KEY (ID) to satisfy the requirement that the primary key column be named ID [CHECKLIST ITEM #10, #15]. Your foreign keys also reference the wrong parent columns: Orders currently references Customers(CustomerID), and OrderItems references Orders(OrderID) and Products(ProductID), but in each parent table the primary key is ID, so you need to reference Customers(ID), Orders(ID), and Products(ID) instead [CHECKLIST ITEMS #11–#14, #16, #17]. In addition, the foreign key syntax order is off for MySQL; change each to the form FOREIGN KEY (CustomerID) REFERENCES Customers(ID) ON DELETE SET NULL (and similarly for the other FKs), with REFERENCES immediately after the column list.

Once you update all primary key definitions to use ID and adjust the foreign key REFERENCES targets and order, your script should execute cleanly and fully meet the task requirements. You’ve already done a solid job on table structure, column names, data types, and using ON DELETE SET NULL, so fixing these constraints will complete the solution.

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Review Summary

I am approving your solution because your ShopDB schema cleanly satisfies all the stated requirements and is valid MySQL DDL. You correctly create the database, select it, and define all four tables (Products, Customers, Orders, OrderItems) with the required columns and only the allowed data types (INT, DATE, VARCHAR(50)). Your primary keys are consistently implemented with ID INT AUTO_INCREMENT and PRIMARY KEY (ID), and your foreign keys correctly reference the parent tables with ON DELETE SET NULL as required. The foreign key relationships between Orders → Customers and OrderItems → Orders/Products are all wired up correctly, so the relational structure matches a typical shop schema. There are no critical or minor issues that need fixing for this task, and the script should execute successfully as-is. Nice work implementing the constraints carefully and keeping the schema clear and consistent—this is a solid solution.

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