如何更新第3行中的列與MySQL中第2行中的列相同？

Question

我做這樣說：

UPDATE products 
    SET products_image = (SELECT products_image 
          FROM products 
          WHERE products_id = 2) 
WHERE products_id = 3; 

...但得到一個錯誤：

ERROR 1093 (HY000): You can't specify target table 'products' for update in FROM clause

Answer 1

UPDATE products p1, products p2 
SET p1.products_image=p2.products_image 
WHERE p1.id=3 AND p2.id=2;