Solution #56
Solution #56
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Thank you for your hard work on this task! 😊 However, there are a few critical issues that need to be addressed before we can approve the pull request:
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Normalization to 3NF: The task requires the database to be normalized to the third normal form (3NF). While you have made progress by splitting the tables, the current structure does not fully comply with the task description. Specifically, ensure that all non-key attributes are fully functionally dependent only on the primary key.
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INSERT Statements: The
INSERTstatements should match the new database structure. Currently, they do not align with the structure described in the task, particularly regarding theProductInventorytable. -
Missing DROP Statement: The task specifies that the existing
ShopDBdatabase should be dropped if it exists. Please include aDROP DATABASE ShopDB;statement at the beginning of your script. -
AUTO_INCREMENT for IDs: Consider adding
AUTO_INCREMENTto theIDcolumns to ensure unique IDs are automatically generated for new entries. -
Foreign Key Constraints: Review the
ON DELETE NO ACTIONconstraints. If you want to allow deletions and automatically remove associated records, consider usingON DELETE CASCADE.
Please address these issues to meet the task requirements. Once these changes are made, your solution will be much closer to the desired outcome. Keep up the great work, and don't hesitate to reach out if you need further assistance! 🚀
✨ Please rate this review in the Platform's notification center. I will be grateful for your feedback! ✨
🔄 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, | ||
| Name VARCHAR(50), | ||
| PRIMARY KEY (ID) | ||
| ID INT, |
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Consider adding AUTO_INCREMENT to the ID column to automatically generate unique IDs for new entries.
task.sql
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| ); | ||
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| CREATE TABLE Warehouses ( | ||
| ID INT, |
There was a problem hiding this comment.
Consider adding AUTO_INCREMENT to the ID column to automatically generate unique IDs for new entries.
task.sql
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| ); | ||
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| CREATE TABLE Products ( | ||
| ID INT, |
There was a problem hiding this comment.
Consider adding AUTO_INCREMENT to the ID column to automatically generate unique IDs for new entries.
task.sql
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| CountryID INT, | ||
| FOREIGN KEY (CountryID) REFERENCES Countries(ID) ON DELETE NO ACTION, | ||
| PRIMARY KEY (ID) | ||
| ID INT, |
There was a problem hiding this comment.
Consider adding AUTO_INCREMENT to the ID column to automatically generate unique IDs for new entries.
task.sql
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| CountryID INT, | ||
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| PRIMARY KEY (ID), | ||
| FOREIGN KEY (CountryID) REFERENCES Countries(ID) ON DELETE NO ACTION |
There was a problem hiding this comment.
The ON DELETE NO ACTION constraint means that you cannot delete a country if there are warehouses associated with it. Ensure this is the desired behavior. If you want to allow deletion and automatically remove associated warehouses, consider using ON DELETE CASCADE.
task.sql
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| WarehouseID INT, | ||
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| PRIMARY KEY (ID), | ||
| FOREIGN KEY (ProductID) REFERENCES Products(ID) ON DELETE NO ACTION, |
There was a problem hiding this comment.
The ON DELETE NO ACTION constraint means that you cannot delete a product if there are inventory records associated with it. Ensure this is the desired behavior. If you want to allow deletion and automatically remove associated inventory records, consider using ON DELETE CASCADE.
task.sql
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| PRIMARY KEY (ID), | ||
| FOREIGN KEY (ProductID) REFERENCES Products(ID) ON DELETE NO ACTION, | ||
| FOREIGN KEY (WarehouseID) REFERENCES Warehouses(ID) ON DELETE NO ACTION |
There was a problem hiding this comment.
The ON DELETE NO ACTION constraint means that you cannot delete a warehouse if there are inventory records associated with it. Ensure this is the desired behavior. If you want to allow deletion and automatically remove associated inventory records, consider using ON DELETE CASCADE.
There was a problem hiding this comment.
Great job on your SQL script! 🎉 You've made significant progress in addressing previous issues, and your code meets the task requirements. Here are some key points and areas for improvement:
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Normalization to 3NF: Your database is well-structured and normalized to the third normal form. The separation into tables like
Countries,Warehouses,Products, andProductInventoryensures that all non-key attributes are fully functionally dependent only on the primary key. Keep up the good work! -
INSERT Statements: The
INSERTstatements are correctly aligned with the table structure and populate the tables with the required test data. This is a crucial step for maintaining data integrity. -
AUTO_INCREMENT for IDs: You've correctly implemented
AUTO_INCREMENTfor ID columns, ensuring unique IDs for new entries. This is essential for maintaining data consistency. -
Foreign Key Constraints: The use of
ON DELETE CASCADEfor foreign key constraints is appropriate for maintaining referential integrity. This ensures that deletions are handled correctly and related records are automatically removed. -
Critical Issue - Missing DROP Statement: One critical area to address is the missing
DROP DATABASE IF EXISTS ShopDB;statement. Including this at the beginning of your script will ensure that the database is dropped if it already exists, preventing potential conflicts.
Overall, your solution is solid, and the decision to approve is to help you move forward with your learning. Please review the comments to improve your code further. Addressing the critical issue mentioned will enhance the functionality and robustness of your script. Keep up the great work, and continue to learn from your experiences! 🚀
✨ Please rate this review in the Platform's notification center. I will be grateful for your feedback! ✨
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| -- Create database and tables | |||
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| CREATE DATABASE ShopDB; | |||
There was a problem hiding this comment.
Consider adding DROP DATABASE IF EXISTS ShopDB; before creating the database to ensure it is dropped if it already exists.
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