What is the significance of using NULL instead of 0 for auto-increment primary key fields in MySQL databases?

Using NULL instead of 0 for auto-increment primary key fields in MySQL databases allows for the database to generate unique identifiers automatically without the risk of clashes with existing records. This ensures the integrity of the data and avoids potential conflicts when inserting new records. It also follows best practices for database design. 

CREATE TABLE example_table (
    id INT PRIMARY KEY AUTO_INCREMENT,
    name VARCHAR(50) NOT NULL
);

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PHP MySQL auto-increment primary key NULL

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