Home/ Questions/Q 6771451
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-05-26T15:26:02+00:00

So when trying to add an autoincrement to a field it comes up with

  • 0

So when trying to add an autoincrement to a field it comes up with #1062 – Duplicate entry ‘1’ for key 1 . I’ve tried removing the primary key and re-adding it and that works fine (which I assume wouldn’t if there was duplicates?)

But when I try to add an autoincrement to the field it throws an error. It gives me a browse option which runs the following SQL:

SELECT *
FROM `myTbl`
WHERE CONCAT_WS( "-", 11 ) = "1"
ORDER BY 11
LIMIT 0 , 30

However this returns a empty result set.. suggesting there are no duplicates. So if there are no duplicates, how come i can’t add an autoincrement?

Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    Do you have any rows with value 0 or NULL for this column? ALTER TABLE can cause primary keys to be resequenced. In the case of a key of 0, MySQL will try to give it the value 1, which will fail if the key 1 already exists.

    Try changing any 0 or NULL values in the column to something higher (and unused).

    • 0