Mysql delete duplicate data to keep the smallest id solution

Search online to delete duplicate data and keep the data with the smallest ID. The method is as follows:

DELETE
FROM
  people
WHERE
  peopleName IN (
    SELECT
      peopleName
    FROM
      people
    GROUP BY
      peopleName
    HAVING
      count(peopleName) > 1
  )
AND peopleId NOT IN (
  SELECT
    min(peopleId)
  FROM
    people
  GROUP BY
    peopleName
  HAVING
    count(peopleName) > 1
)

When I use it myself, an error message is displayed:

delete from tb where id in (SELECT max(id) from tb GROUP BY user HAVING count(user)>1)

[Err] 1093 - You can't specify target table 'XXX' for update in FROM clause

It is not known what caused it yet.

Then find a way to distribute the operation. First, filter out the data with duplicate users, and then use max() to select the larger row:

SELECT max(id) from tb GROUP BY user HAVING count(user)>1

Then delete the redundant data one by one according to the obtained max(id)

delete from tb where id=xx

This is a stupid method, let’s solve the problem temporarily.

Summarize

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