MySQL nextval does not exist

MySQL does not have a "nextval" function like some other databases (such as PostgreSQL). Instead, you can use the "AUTO_INCREMENT" attribute on a column to automatically generate unique values for that column when new rows are inserted. For example, you can define a table with an "id" column as follows:

CREATE TABLE mytable (
  id INT AUTO_INCREMENT PRIMARY KEY,
  name VARCHAR(255)
);

Then when you insert a new row without specifying a value for the "id" column, MySQL will automatically generate a unique value for it:

INSERT INTO mytable (name) VALUES ('John');

The "id" column will be automatically incremented for each new row inserted into the table.