如果行重复，MySQL更新

我有一张有重复行的桌子。我想在删除行之前更新它们，只是为了确保删除好的行

删除查询如下所示，并且可以工作：

DELETE FROM cscart_products 
WHERE updated_timestamp 
NOT IN (SELECT * 
    FROM (SELECT MAX(n.updated_timestamp) 
    FROM cscart_products n 
    GROUP BY n.product_code) x)

示例表：

product_code    product_type    status    updated_timestamp
DUSP1893        P               A         1551
DUSP1893        P               A         322
AH324444        P               A         555
AH324444        P               A         21332

某些产品具有相同的产品代码。我想用更小的更新时间戳从状态a更新到状态H

---

谢谢

您必须在交易时这样做。 1.启动事务 2.使现代化 3.删去 4.提交事务

START TRANSACTION;
UPDATE cscart_products SET status="H" WHERE updated_timestamp<some_value AND product_code IN (code1,code2,....codeN);
DELETE FROM cscart_products WHERE status="H" AND product_code IN (code1,code2,....codeN);
COMMIT;

启动事务；
UPDATE cscart_products SET status=“H”其中updated_timestamp首先获取时间戳较小的行，然后更新这些记录，如下所示：

UPDATE cscart_products
INNER JOIN (
  SELECT product_code pc, MIX(updated_timestamp) ts
  FROM cscart_products
  GROUP BY product_code
) t
ON cscart_products.product_code = t.pc 
AND cscart_products.updated_timestamp = t.ts
SET status = 'H'

内部查询将为您提供具有较小时间戳的产品代码行。
应该不会比这更复杂：

-- mark the rows for which the updated_timestamp is smaller
-- than the maximum timestamp for that product_code
UPDATE cscart_products 
SET status = 'H'
WHERE updated_timestamp 
NOT IN (SELECT * 
    FROM (SELECT MAX(n.updated_timestamp) 
    FROM cscart_products n 
    GROUP BY n.product_code) x);

-- delete the marked rows (or don't, whatever you feel like)
DELETE FROM cscart_products 
WHERE status = 'H';

更新产品代码中重复的最小更新时间戳，状态为“H”

UPDATE cscart_products SET status='H'
WHERE updated_timestamp IN
(SELECT * FROM(SELECT MIN(updated_timestamp) FROM cscart_products  
GROUP BY product_code HAVING COUNT(product_code)>1)  X);

这篇文章读了三遍，仍然没有弄清楚真正的问题是什么。您只想在状态上添加一个额外的条件？例如，我想在DUSP1893将状态从A更改为H，其中更新的时间戳更小。AH324444也一样。为什么OP必须在事务中执行此操作？