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Review Summary
I am requesting changes because there is a critical requirement missing that affects running and re-running the script. The task explicitly requires that an existing ShopDB be dropped before recreating it, but your task.sql only does CREATE DATABASE ShopDB; without a preceding DROP DATABASE IF EXISTS ShopDB;, so the script will fail on the second run if the database already exists. Please add DROP DATABASE IF EXISTS ShopDB; immediately before CREATE DATABASE ShopDB; so the script is idempotent and follows the instructions. In addition, your Warehouses and ProductInventory tables define FOREIGN KEY constraints but do not specify ENGINE=InnoDB; on some MySQL setups this will cause foreign keys to be ignored or fail, which can break referential integrity. Please update those CREATE TABLE statements to include ENGINE=InnoDB (and optionally DEFAULT CHARSET=utf8mb4) so the foreign keys work reliably. Once those changes are made, your otherwise well-structured normalized schema and inserts will fully meet the task requirements.
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task.sql
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| CREATE TABLE Products ( | ||
| ID INT, | ||
| ProductName VARCHAR(50), | ||
| WarehouseAmount INT, | ||
| PRIMARY KEY (ID) | ||
| ); |
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The task requires deleting the existing ShopDB before recreating it. Add DROP DATABASE IF EXISTS ShopDB; prior to CREATE DATABASE ShopDB; so running the script is idempotent and matches the implementation instructions in the description.
| CREATE TABLE Warehouses ( | ||
| ID INT, | ||
| WarehouseName VARCHAR(50), | ||
| WarehouseAddress VARCHAR(50), | ||
| WarehouseAddress VARCHAR(50), | ||
| CountryID INT, | ||
| FOREIGN KEY (CountryID) REFERENCES Countries(ID) ON DELETE NO ACTION, | ||
| PRIMARY KEY (ID) | ||
| PRIMARY KEY (ID), | ||
| FOREIGN KEY (CountryID) REFERENCES Countries(ID) ON DELETE NO ACTION | ||
| ); | ||
|
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| CREATE TABLE ProductInventory ( | ||
| ID INT, | ||
| ProductID INT, | ||
| WarehouseAmount INT, | ||
| WarehouseID INT, | ||
| PRIMARY KEY (ID), | ||
| FOREIGN KEY (ProductID) REFERENCES Products(ID) ON DELETE NO ACTION, | ||
| FOREIGN KEY (WarehouseID) REFERENCES Warehouses(ID) ON DELETE NO ACTION |
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You use FOREIGN KEY constraints in Warehouses and ProductInventory. MySQL requires InnoDB for enforced foreign keys. Add ENGINE=InnoDB to these CREATE TABLE statements (or ensure the server default is InnoDB) to avoid foreign key being ignored or causing runtime issues.
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Review Summary
I am approving your solution because the SQL script correctly normalizes the ShopDB schema into separate Countries, Products, Warehouses, and ProductInventory tables, and it recreates and populates the database without any functional blockers. You use DROP DATABASE IF EXISTS ShopDB followed by CREATE DATABASE and USE ShopDB, and all tables are created with ENGINE=InnoDB and proper foreign key relationships, so referential integrity will work as expected. The INSERT statements at the end are properly adapted to the new normalized structure and preserve the original test data, which satisfies the requirement to migrate data from the 1NF-style table into the 3NF design.
The only notable discrepancy is that the assignment text still mentions a denormalized ProductInventory with columns like ProductName, WarehouseAmount, and WarehouseAddress, while your implementation correctly uses ProductID and WarehouseID; this is a spec inconsistency rather than a functional bug, so no changes are required for this task. As optional polish, you could mark primary key columns as INT NOT NULL AUTO_INCREMENT and specify DEFAULT CHARSET=utf8mb4 for the database and tables to improve portability, but these are enhancements, not requirements. Overall, your script is coherent, runnable, and meets the core normalization and data-migration requirements—well done on structuring the schema cleanly and using foreign keys appropriately.
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