How can the concept of normalization be applied to improve the structure of a database with multiple columns for different entities in PHP?

The concept of normalization can be applied to improve the structure of a database with multiple columns for different entities by breaking down the data into separate tables to reduce redundancy and improve data integrity. This can be achieved by creating relationships between the tables using primary and foreign keys.

// Example of creating two tables with a one-to-many relationship in PHP

// Create a table for entities
CREATE TABLE entities (
    id INT PRIMARY KEY,
    name VARCHAR(50),
    description TEXT
);

// Create a table for attributes related to entities
CREATE TABLE attributes (
    id INT PRIMARY KEY,
    entity_id INT,
    attribute_name VARCHAR(50),
    attribute_value VARCHAR(50),
    FOREIGN KEY (entity_id) REFERENCES entities(id)
);