Solution#141
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Review Summary
Great job starting the database normalization process! You've correctly separated the warehouse information into its own table, which is an excellent first step.
However, this requires changes because the database schema is not yet in Third Normal Form (3NF), which is a core requirement. The ProductAmount table currently mixes product details (ProductName) with inventory stock levels, leading to data redundancy. To resolve this, you should create a separate Products table for product-specific information and adjust the ProductInventory table to link products and warehouses with their specific quantities. After updating the schema, please ensure the INSERT statements are updated accordingly.
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Footnotes
mateacademy-ai-mentor
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Review Summary
Excellent progress on normalizing the database! However, this requires a few changes as the script currently fails to run and doesn't meet all requirements.
First, to achieve full Third Normal Form (3NF), the CountryID column should be moved from ProductInventory to the Warehouse table. This resolves a transitive dependency, as a country is dependent on the warehouse, not the product inventory.
Second, there are several syntax errors in your INSERT statements that cause the script to fail:
- One statement incorrectly tries to insert into
ProductAmountinstead ofProducts. - The
ProductInventoryinserts have a mismatch between the number of columns specified and the values provided.
Lastly, please add the required DROP DATABASE IF EXISTS ShopDB; command at the beginning of the script. Addressing these points will get your solution ready for approval!
✨ Please rate this review in the Platform's notification center1. I will be grateful for your feedback! ✨
Important
Fix the issues, commit the changes, and then re-request my review using the Re-request review button2 in the Reviewers tab.
Tip
If you have any comments about this review, please leave a message in the Add a comment section below and mention me with the @mateacademy-ai-mentor tag3.
I will read your message during my next review of your pull request. Please do not reply directly to my comments, as that feature is not supported yet.
Caution
Do not close the pull request until the review is complete. Closing it early can lead to unexpected behavior and disrupt the review process.
Footnotes
mateacademy-ai-mentor
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mateacademy-ai-mentor
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Review Summary
Great job normalizing the database schema to the Third Normal Form! The table structure is much improved. I am approving this submission to help you move forward, but there are a few important points to review for future tasks.
First, the script is missing the required DROP DATABASE IF EXISTS ShopDB; command at the beginning, which is crucial for ensuring it can be run multiple times without errors.
Additionally, you've inserted 'AwersomeProduct' twice into the Products table. The goal of normalization is to avoid this kind of redundancy. The correct approach is to have a single entry for the product and have both inventory records in ProductInventory reference that one ProductID. For example, the second inventory record should use ProductID 1, not 2.
As a best practice, for columns with AUTO_INCREMENT, it's better to omit them from your INSERT statements and let the database assign the ID automatically.
Keep up the great work, you're very close to a perfect solution!
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Footnotes
| INSERT INTO ProductInventory (ID,ProductName,WarehouseAmount,WarehouseName,WarehouseAddress,CountryID) | ||
| VALUES (2, 'AwersomeProduct', 5, 'Warehouse-2', 'City-2, Street-2',2); | ||
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| INSERT INTO Warehouse (ID, WarehouseName, WarehouseAddressCity, WarehouseAddressStreet, CountriesID) |
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The ID column in the Warehouse table has AUTO_INCREMENT enabled. It's a best practice to let the database manage these values. You can do this by omitting the ID column from your INSERT statement and the corresponding value from the VALUES clause. The same applies to the Products table.
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| INSERT INTO Products (ID, ProductName) | ||
| VALUES (1, 'AwersomeProduct'); | ||
| INSERT INTO Products (ID, ProductName) |
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The Products table should contain unique product entries to avoid redundancy. Inserting 'AwersomeProduct' a second time creates a different product record with the same name. To represent a single product type stored in multiple locations, there should be only one record for 'AwersomeProduct' in this table. This INSERT statement should be removed.
| INSERT INTO ProductInventory (ID, WarehouseID, ProductID, WarehouseAmount) | ||
| VALUES (1, 1, 1, 2); | ||
| INSERT INTO ProductInventory (ID, WarehouseID, ProductID, WarehouseAmount) | ||
| VALUES (2, 2, 2, 5); |
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This inventory record is for 'AwersomeProduct'. Since there should only be one record for this product in the Products table (with ID 1), this ProductID should be 1 instead of 2 to correctly link to it.
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