What is wrong with my SQL here? #1089 - Incorrect prefix key

Question

CREATE TABLE `table`.`users` (
    `id` INT(11) NOT NULL AUTO_INCREMENT,
    `username` VARCHAR(50) NOT NULL,
    `password` VARCHAR(50) NOT NULL,
    `dir` VARCHAR(         


        

Answer 1

In my case, i faced the problem while creating table from phpmyadmin. For id column i choose the primary option from index dropdown and filled the size 10.

If you're using phpmyadmin, to solve this problem change the index dropdown option again, after reselecting the primary option again it'll ask you the size, leave it blank and you're done.

Answer 2

according to the latest version of MySQL (phpMyAdmin), add a correct INDEX while choosing primary key. for example: id[int] INDEX 0 ,if id is your primary key and at the first index. Or,

---

For your problem try this one

CREATE TABLE `table`.`users` (
    `id` INT(11) NOT NULL AUTO_INCREMENT,
    `username` VARCHAR(50) NOT NULL,
    `password` VARCHAR(50) NOT NULL,
    `dir` VARCHAR(100) NOT NULL,
    PRIMARY KEY (`id`)
) ENGINE = MyISAM;

Answer 3

It works for me:

CREATE TABLE `users`(
    `user_id` INT(10) NOT NULL AUTO_INCREMENT,
    `username` VARCHAR(255) NOT NULL,
    `password` VARCHAR(255) NOT NULL,
    PRIMARY KEY (`user_id`)
) ENGINE = MyISAM;       

Answer 4

I also had this same problem.
Solution work for me:

CREATE TABLE IF NOT EXISTS `users` (
  `sr_no` int(11) NOT NULL AUTO_INCREMENT,
  `username` VARCHAR(50) NOT NULL,
    `password` VARCHAR(50) NOT NULL,
    `dir` VARCHAR(100) NOT NULL,
  PRIMARY KEY (`sr_no`)
) ENGINE=InnoDB  DEFAULT CHARSET=latin1 AUTO_INCREMENT=3 ;

I paste this code in SQL and run, it works fine.

Answer 5

CREATE TABLE `table`.`users` (
    `id` INT(11) NOT NULL AUTO_INCREMENT,
    `username` VARCHAR(50) NOT NULL,
    `password` VARCHAR(50) NOT NULL,
    `dir` VARCHAR(100) NOT NULL,
    PRIMARY KEY (`id`(11))
) ENGINE = MyISAM;

Change To

CREATE TABLE `table`.`users` (
        `id` INT(11) NOT NULL AUTO_INCREMENT,
        `username` VARCHAR(50) NOT NULL,
        `password` VARCHAR(50) NOT NULL,
        `dir` VARCHAR(100) NOT NULL,
        PRIMARY KEY (`id`)
    ) ENGINE = MyISAM;

Answer 6

Problem is the same for me in phpMyAdmin. I just created a table without any const. Later I modified the ID to a Primary key. Then I changed the ID to Auto-inc. That solved the issue.

ALTER TABLE `users` CHANGE `ID` `ID` INT(11) NOT NULL AUTO_INCREMENT;