In PHP, what considerations should be made when setting up auto_increment for primary keys in a database table, and how does it relate to the issue of duplicate entries for key 2?

When setting up auto_increment for primary keys in a database table, it is important to ensure that the field is set as the primary key and auto_increment. This will automatically generate a unique key for each new entry, preventing duplicate entries for the key. To avoid issues with duplicate entries for key 2, make sure that the auto_increment value starts at a number greater than the existing keys in the table. 

CREATE TABLE users (
    id INT AUTO_INCREMENT PRIMARY KEY,
    username VARCHAR(50) NOT NULL
);

ALTER TABLE users AUTO_INCREMENT = 1001;

Keywords

PHP auto_increment primary keys database table duplicate entries

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