如何使用 MySql 使用另一个表中的值更新两个表上的值

Question

I have 3 tables, T1, T2, T3. I need to update the stock_status from T1 and limited from T2 with the values from stock_status and limited from T3, only where the sku are matching. Also the entity_id is the correspondent for product_id.

Here is an image to understand better

I'm stuck at moving the values from stock_status from T3 in stock_status from T1, since I don't have a common field directly.

For limited field, I tried.

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

Answer 1

You should use add an inner join between t2 and t1 for update also t1.stock_status

  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

Answer 2

Try these

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;