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mysql can’t specify target table for update in FROM clause

In MySQL, you can’t modify the same table which you use in the SELECT part.

 

If you absolutely need the subquery, there’s a workaround

 

UPDATE tbl SET col = (
  SELECT * FROM (SELECT.... FROM) AS x);

The nested subquery in the FROM clause creates an implicit temporary table, so it doesn't count as the same table you're updating
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