There can be only one auto column

Question

How do I correct the error from MySQL \'you can only have one auto increment column\'.

CREATE TABLE book (
   id INT AUTO_INCREMENT NOT NULL,
   accepted_ter         


        

Answer 1

Note also that "key" does not necessarily mean primary key. Something like this will work:

CREATE TABLE book (
    isbn             BIGINT NOT NULL PRIMARY KEY,
    id               INT    NOT NULL AUTO_INCREMENT,
    accepted_terms   BIT(1) NOT NULL,
    accepted_privacy BIT(1) NOT NULL,
    INDEX(id)
) ENGINE=InnoDB DEFAULT CHARSET=latin1;

This is a contrived example and probably not the best idea, but it can be very useful in certain cases.