SQL SUM函数获取库存余额

Question

更新：

我有 2 个销售产品的地点，每个地点有 1 个 table ...我在下图中显示的每个地点都有余额 ...现在我想将一个余额中的余额总和，我想获得物品的全部余额（2 个地点的 SUM 余额）......需要你的帮助

我使用此查询来获取上面显示的余额

Select item_id , sum(purchase)-sum(sales)as total from location_1  group by item_id 
HAVING sum(purchase)-sum(sales) <> 0
UNION ALL
Select item_id,  sum(purchase)-sum(sales) as total from location_2  group by item_id, 
HAVING sum(purchase)-sum(sales) <> 0

Answer 1

您可以尝试去掉表格中 itemid 列末尾的数字，然后合并它们。

SELECT t.itemid, sum(purchase)- sum(sales) as balance
FROM (
      SELECT left(itemid, length(itemid) -1) as itemid, 
             sales, 
             purchase 
      FROM Location_1
      UNION ALL 
      SELECT left(itemid, length(itemid) -1) as itemid,
             sales,
             purchase
      FROM Location_2
     ) AS t
     GROUP BY t.itemid;

db fiddle link

SQL SUM函数获取库存余额

SQL SUM function to get inventory balance

sql

sum