MYSQL, When defining a table does the UNIQUE constraint have to be used in conjunction with an INTEGER or can it be any datatype?

The only way I can have this error, if the first table is created with MyISAM engine and the second (tried to be created) with InnoDB Check the definition of the created table user using: SHOW CREATE TABLE user If that's the case, drop it and recreate it with: CREATE TABLE IF NOT EXISTS `user`( user_id INT NOT NULL AUTO_INCREMENT PRIMARY KEY, username VARCHAR(50) NOT NULL, `password` VARCHAR(255) NOT NULL ) ENGINE = InnoDB.

The only way I can have this error, if the first table is created with MyISAM engine and the second (tried to be created) with InnoDB. Check the definition of the created table user, using: SHOW CREATE TABLE user ; If that's the case, drop it and recreate it with: CREATE TABLE IF NOT EXISTS `user`( user_id INT NOT NULL AUTO_INCREMENT PRIMARY KEY, username VARCHAR(50) NOT NULL, `password` VARCHAR(255) NOT NULL ) ENGINE = InnoDB.

The only way I can have this error, if the first table is created with MyISAM engine and the second (tried to be created) with InnoDB .

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