Question

I have duplicated (copied) a table and for some reason Primary Keys wasnt added.
Now I have a lot of new records were added recently with 0 value in the id field. All the previous records does have a unique ID (from 1 to 302979).

How to fix this?

#1062 - Duplicate entry '0' for key 'PRIMARY'

AUTO_INCREMENT wasnt added as well.

CREATE TABLE `result` (
  `id` int(11) NOT NULL DEFAULT '0',
  `status` varchar(50) NOT NULL,
  `status_date` datetime NOT NULL,
  `member_id` int(11) NOT NULL
) ENGINE=MyISAM DEFAULT CHARSET=latin1

Answer 1

try

update result
inner join (select @row := (select max(id) from result)) r
set id = (@row := @row + 1)
where id = 0

to correct the wrong ids.

then add auto_increment to your table

ALTER TABLE `result` CHANGE COLUMN `id` `id` INT(11) NOT NULL AUTO_INCREMENT,
ADD PRIMARY KEY (`id`) ;

and then use

ALTER TABLE result AUTO_INCREMENT = 1234;

in which you replace 1234 with the number you want to start your increment value. It can be the highest id + 1 for instance. You could get that number with

select max(id)+1 from result;