Solution #60
Solution #60
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Thank you for your hard work on this task! 😊 While you've made good progress towards normalizing the database, there are a few critical issues that need to be addressed to fully meet the task requirements:
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Normalization to 3NF: The
ProductInventorytable should not directly reference attributes likeWarehouseName,WarehouseAddress, andCountryID. Instead, it should rely onWarehouseID, with proper relationships to other tables. This is crucial for achieving the third normal form (3NF). -
Missing
DROP DATABASEStatement: The task specifies that the script should includeDROP DATABASE ShopDB;to handle cases where the database already exists. This is important for ensuring the script can be run multiple times without errors. -
Test Data Population: Ensure that the
INSERTstatements are correctly populating data according to the new normalized schema. This is essential for verifying the database structure.
Additionally, consider reviewing the foreign key constraints and using ON DELETE CASCADE where appropriate to maintain data integrity when related records are deleted.
Please address these issues to ensure the database is correctly structured and meets the task requirements. Keep up the great work, and don't hesitate to reach out if you need further guidance! 🌟
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🔄 Fix the issues, commit the changes, and then re-request my review using the Re-request review button in the Reviewers tab.
task.sql
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| ID INT AUTO_INCREMENT, | ||
| Name VARCHAR(50), | ||
| CountryID INT, | ||
| FOREIGN KEY (CountryID) REFERENCES Countries(ID) ON DELETE NO ACTION, |
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The foreign key constraint ON DELETE NO ACTION might cause issues if a country is deleted while cities still reference it. Consider using ON DELETE CASCADE if you want to automatically delete dependent cities when a country is deleted.
task.sql
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| ID INT AUTO_INCREMENT, | ||
| StreetName VARCHAR(100), | ||
| CityID INT, | ||
| FOREIGN KEY (CityID) REFERENCES Cities(ID) ON DELETE NO ACTION, |
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Similar to the previous comment, using ON DELETE NO ACTION for the foreign key constraint might cause issues if a city is deleted while addresses still reference it. Consider using ON DELETE CASCADE if appropriate.
task.sql
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| ID INT AUTO_INCREMENT, | ||
| Name VARCHAR(50), | ||
| AddressID INT, | ||
| FOREIGN KEY (AddressID) REFERENCES Addresses(ID) ON DELETE NO ACTION, |
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For the foreign key constraint on AddressID, consider using ON DELETE CASCADE if you want to automatically delete dependent warehouses when an address is deleted.
task.sql
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| ProductName VARCHAR(50), | ||
| WarehouseAmount INT, | ||
| WarehouseID INT, | ||
| FOREIGN KEY (WarehouseID) REFERENCES Warehouses(ID) ON DELETE NO ACTION, |
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The foreign key constraint ON DELETE NO ACTION for WarehouseID might cause issues if a warehouse is deleted while products still reference it. Consider using ON DELETE CASCADE if appropriate.
task.sql
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| VALUES ('AwersomeProduct', 2, 1); | ||
| INSERT INTO ProductInventory (ProductName,WarehouseAmount, WarehouseID) | ||
| VALUES ('AwersomeProduct', 5, 2); |
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There seems to be a typo in the product name 'AwersomeProduct'. It should likely be 'AwesomeProduct'.
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Review Summary
Great effort on your SQL script! 🎉 While your .gitignore file is perfectly set up, there are a few critical areas in your SQL script that need attention:
-
Missing
DROP DATABASEStatement: It's important to includeDROP DATABASE ShopDB;at the beginning of your script. This ensures that the script can be executed multiple times without encountering errors due to the database already existing. -
Normalization to 3NF: You've done a good job normalizing the
ProductInventorytable by usingWarehouseIDwith proper foreign key relationships. This aligns with the third normal form (3NF) principles. -
Test Data Population: Ensure that your
INSERTstatements correctly populate data according to the normalized schema. There's a minor issue with using a non-existentWarehouseIDof2in theProductInventorytable. Please correct this to match the available data. -
Foreign Key Constraints: Your foreign key constraints are well-defined, and the use of
ON DELETE CASCADEis appropriate for maintaining data integrity.
The decision to approve is made to help you move forward with your learning journey. Please review the comments and address the issues to improve your code. Remember, addressing critical issues like the missing DROP DATABASE statement is essential to avoid similar problems in the future. Keep up the good work and continue learning from these experiences! 🚀
✨ Please rate this review in the Platform's notification center. I will be grateful for your feedback! ✨
task.sql
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| @@ -1,33 +1,72 @@ | |||
| -- Drop the old database | |||
| CREATE DATABASE ShopDB; | |||
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You should include DROP DATABASE ShopDB; before this line to handle cases where the database already exists.
| INSERT INTO ProductInventory (ProductName, WarehouseAmount, WarehouseID) | ||
| VALUES ('AwersomeProduct', 2, 1); | ||
| INSERT INTO ProductInventory (ProductName, WarehouseAmount, WarehouseID) | ||
| VALUES ('AwersomeProduct', 5, 2); |
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Ensure that the test data is correctly populated according to the normalized schema. Verify that all foreign key references are valid.
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