what is auto_increment = 4 in mysql create statement code example

Example 1: create a table with an id in mysql

CREATE TABLE DemoT (
    Personid int NOT NULL AUTO_INCREMENT,
    LastName varchar(111) NOT NULL,
    FirstName varchar(111),
    Age int,
    PRIMARY KEY (Personid)
);

Example 2: create table primary key auto increment mysql

define primary key auto increment

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