Solution#175
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Review Summary
Your SQL script contains critical syntax errors that prevent execution. The primary issue is an incorrect FOREIGN KEY constraint syntax in the CREATE TABLE statement - line 12 fails with a syntax error near REFERENCES Countries(ID), PRIMARY KEY (ID). In MySQL, when using inline foreign key syntax, you should use column_name INT REFERENCES Countries(ID) without the FOREIGN KEY keyword, or use explicit constraint syntax: CONSTRAINT fk_name FOREIGN KEY (column_name) REFERENCES Countries(ID). Additionally, fix the trailing comma after PRIMARY KEY (ID) in the Products table definition and ensure consistent spelling between Adress and Address across your CREATE TABLE and INSERT statements. Once these syntax errors are corrected, your database schema will execute properly.
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Footnotes
| CREATE TABLE Products ( | ||
| ID INT, | ||
| Name VARCHAR(50), | ||
| PRIMARY KEY (ID), |
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Trailing comma before closing parenthesis causes SQL syntax error. Remove the comma after PRIMARY KEY (ID).
| INSERT INTO Countries (ID,Name) | ||
| VALUES (2, 'Country2'); | ||
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| INSERT INTO Warehouses (ID, Name, Adress, CountryID) |
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Column name 'Adress' is misspelled. The table defines 'Adress' but line 46 uses 'Address'. These must match.
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| INSERT INTO Warehouses (ID, Name, Adress, CountryID) | ||
| VALUES (1, 'Warehouse-1', 'City-1, Street-1', 1); | ||
| INSERT INTO Warehouses (ID, Name, Address, CountryID) |
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Column name 'Address' doesn't match the table definition which uses 'Adress'. This INSERT will fail due to unknown column.
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Review Summary
The task.sql file correctly implements third normal form (3NF) normalization by decomposing the original ProductInventory table into four properly structured tables: Countries, Warehouses, Products, and ProductInventory, with correct foreign key relationships using explicit CONSTRAINT syntax. All previous issues have been resolved—foreign key constraints are syntactically correct, column naming is consistent, and no trailing commas remain. The test data is correctly distributed across the normalized tables and the script is ready for validation.
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