我怎样才能从MySQL的另一个表更新与值的两个表中的值

Question

我有3个表，T1，T2，T3。我需要更新从T1 stock_status和来自T2限于与来自stock_status值并限制从T3，只有在SKU是匹配的。另外，ENTITY_ID是PRODUCT_ID记者。

这是更好地了解图像

我被困在从stock_status从T3在stock_status从T1移动值，因为我不直接有一个共同的领域。

对于有限的领域，我试过了。

UPDATE t2,t3 INNER JOIN t3 on t2.sku = t3.sku SET t2.limited = t3.limited

Answer 1

试试这些

UPDATE t1
        JOIN
    t2
        JOIN
    t3 
SET 
    t1.stock_status = t3.stock_status
WHERE
    t1.product_id = t2.entity_id
        AND t2.sku = t3.sku;

.

UPDATE t2
        JOIN
    t3 
SET 
    t2.limited = t3.limited
WHERE
    t2.sku = t3.sku;

Answer 2

你应该用加T1和T2的更新也t1.stock_status之间的内部连接

  UPDATE t2,t1 
  INNER JOIN t3 on t2.sku = t3.sku 
  INNER JOIN t1 on t1.product_id = t2.entity_id
  SET t2.limited = t3.limited, 
      t1.stock_status = t3.stock_status