MYSQL查询-使用另一个表中的多个ID求和项

如图所示，我有两张桌子。我可以从item_transactions表中计算每个item_id的销售数量之和。在一个单独的列中，我想从I_multiple_int_attributes表中求出该商品所有以前版本的销售数量之和（有些商品最多有4个以前的版本）。有人能给我指出正确的方向吗

当前查询：

SELECT t.item_id, SUM(t.qty_sold) as current_id_sales, SUM(?) as previous_id_sales
FROM gnpcb.item_transactions t join gnpcb.i_multiple_int_attributes a on t.item_id = a.id
and a.type = 'items' and a.attribute = 'previous_editions'
WHERE t.id_type in ('invoice', 'credit') and t.item_id IN ('18117', '17473', '17568') 
and t.transaction_type in ('sale', 'return', 'return_nts')
GROUP BY t.item_id;

预期结果：

+---------+------------------+-------------------+
| item_id | current_id_sales | previous_id_sales |
+---------+------------------+-------------------+
|   17473 |            15743 |              9625 |
|   17568 |             3893 |             24232 |
|   18117 |            14430 |              8083 |
+---------+------------------+-------------------+

表1：项目交易

+---------+---------+----------+----------------+----------------+
| id_type | item_id | qty_sold | price_extended | date_effective |
+---------+---------+----------+----------------+----------------+
| invoice |    18117 |        8 |        13.1600 | 2016-10-01     |
| invoice |    17473 |        1 |         2.2500 | 2016-10-01     |
| invoice |    18117 |        1 |         1.0000 | 2016-10-01     |
| invoice |    18117 |        7 |         2.0000 | 2016-10-01     |
| invoice |    18117 |        5 |         3.0000 | 2016-10-01     |
| invoice |    17473 |        3 |         4.0000 | 2016-10-01     |
| invoice |    17568 |        1 |         4.0000 | 2016-10-01     |
| invoice |    17568 |        5 |         3.0000 | 2016-10-01     |
| invoice |    18117 |        8 |         2.0000 | 2016-10-01     |
| invoice |    17473 |        1 |         1.0000 | 2016-10-01     |
+---------+---------+----------+----------------+----------------+

表2:i_多个_int_属性

+-------+-------+------------+-------------------+-------+
| type  | id    | sort_order | attribute         | value |
+-------+-------+------------+-------------------+-------+
| items | 17473 |          1 | previous_editions | 15743 |
| items | 17568 |          1 | previous_editions |  3893 |
| items | 17568 |          2 | previous_editions |  7626 |
| items | 18117 |          1 | previous_editions | 14430 |
| items | 18117 |          2 | previous_editions | 17337 |
| items | 18117 |          3 | previous_editions | 17123 |
| items | 18117 |          4 | previous_editions | 17614 |
+-------+-------+------------+-------------------+-------+

---

一种方法是“当前组”、“上一组”和“加入”

select curr.item_id, curr.sales, prev.sales
from (
    SELECT t.item_id, SUM(t.qty_sold) as sales 
    FROM gnpcb.item_transactions t 
    join gnpcb.i_multiple_int_attributes a on t.item_id = a.id
                and a.type = 'items' and a.attribute = 'previous_editions'
    WHERE t.id_type in ('invoice', 'credit') and t.item_id IN ('18117', '17473', '17568') and t.transaction_type in ('sale', 'return', 'return_nts')
    GROUP BY t.item_id) curr
left join(
    SELECT a.id as item_id, SUM(t.qty_sold) as sales 
    FROM gnpcb.item_transactions t 
    join gnpcb.i_multiple_int_attributes a on t.item_id = a.value
                and a.type = 'items' and a.attribute = 'previous_editions'
    WHERE t.id_type in ('invoice', 'credit') and t.item_id IN ('18117', '17473', '17568') and t.transaction_type in ('sale', 'return', 'return_nts')
    GROUP BY a.id) prev on curr.item_id = prev.item_id

---

一种方法是“当前组”、“上一组”和“加入”

select curr.item_id, curr.sales, prev.sales
from (
    SELECT t.item_id, SUM(t.qty_sold) as sales 
    FROM gnpcb.item_transactions t 
    join gnpcb.i_multiple_int_attributes a on t.item_id = a.id
                and a.type = 'items' and a.attribute = 'previous_editions'
    WHERE t.id_type in ('invoice', 'credit') and t.item_id IN ('18117', '17473', '17568') and t.transaction_type in ('sale', 'return', 'return_nts')
    GROUP BY t.item_id) curr
left join(
    SELECT a.id as item_id, SUM(t.qty_sold) as sales 
    FROM gnpcb.item_transactions t 
    join gnpcb.i_multiple_int_attributes a on t.item_id = a.value
                and a.type = 'items' and a.attribute = 'previous_editions'
    WHERE t.id_type in ('invoice', 'credit') and t.item_id IN ('18117', '17473', '17568') and t.transaction_type in ('sale', 'return', 'return_nts')
    GROUP BY a.id) prev on curr.item_id = prev.item_id

---

非常感谢。在您的第二个子查询WHERE子句中，我必须将“t.item\U id In”更改为“a.id In”），但这正是我所需要的。谢谢！在您的第二个子查询WHERE子句中，我必须将“t.item_id In”更改为“a.id In”），但这正是我所需要的。