sql add auto increment id to existing table code example
Example 1: sql query to make a existing column auto increment
Alter table table_name modify column_name datatype(length) AUTO_INCREMENT PRIMARY KEY
Example 2: 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 3: how to alter auto increment in sql
INSERT INTO Persons (Personid,FirstName,LastName)
VALUES (seq_person.nextval,'Lars','Monsen');
Example 4: mysql add auto increment id existing table
ALTER TABLE `users` ADD `id` INT NOT NULL AUTO_INCREMENT PRIMARY KEY