why use auto increment in sql for id code example

Example 1: how to auto increment in sql

CREATE TABLE Persons (
    Personid int NOT NULL AUTO_INCREMENT,
    LastName varchar(255) NOT NULL,
    FirstName varchar(255),
    Age int,
    PRIMARY KEY (Personid)
);
INSERT INTO Persons (FirstName,LastName)
VALUES ('Lars','Monsen');

Example 2: how to alter auto increment in sql

INSERT INTO Persons (Personid,FirstName,LastName)

VALUES (seq_person.nextval,'Lars','Monsen');

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