How does the concept of normalization apply to the issue described in the forum thread regarding storing category IDs as serialized arrays?

The issue described in the forum thread regarding storing category IDs as serialized arrays is a violation of database normalization principles. To solve this issue, the category IDs should be stored in a separate table with a one-to-many relationship to the main table, instead of being serialized and stored as an array in a single column. 

// Create a new table to store category IDs
CREATE TABLE product_categories (
    id INT AUTO_INCREMENT PRIMARY KEY,
    product_id INT,
    category_id INT,
    FOREIGN KEY (product_id) REFERENCES products(id),
    FOREIGN KEY (category_id) REFERENCES categories(id)
);

// Update the main table to remove the serialized array column
ALTER TABLE products DROP COLUMN category_ids;

// Insert category IDs into the new table for each product
INSERT INTO product_categories (product_id, category_id)
SELECT id, category_id
FROM products;

Keywords

Normalization category IDs serialized arrays forum thread PHP

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