SELECT 在 SQL 服务器中显示 OnHand、Sale 和 Purchase 表中具有 either/or Qty 字段不为空的所有不同行

Question

我需要在 SQL 服务器中编写一个 SELECT 查询，该服务器使用 JOIN 或 UNION 选择不同的 ItmNo 或 Code 来自 3 个表的行 OnHand、Sale 和 Purchase.

这是我拥有的表格和我需要的表格的详细信息。 ItmNo and/or Code 列可以用作外键来连接表。

这些是我的输入表-

Table 手头

ID           ItmNo     Code   Qty
----------------------------------
1            I001      001    100
2            I001      001     50
3            I003      003    300

Table 促销

ID          ItmNo     Code   Qty
----------------------------------
1           I001      001    100
2           I004      004    
3           I003      003    120

Table 购买

ID          ItmNo     Code   Qty
----------------------------------
1           I005      005     10
2           I003      003    200
3           I003      003    300

这就是我需要的输出。此处应仅显示 DISTINCT ItmNo 和 Code：

ID          ItmNo     Code   SumQtyOnHand    SumQtyOnSale    SumQtyOnPurchase
------------------------------------------------------------------------------
1           I001      001    150             100
2           I003      003    300             120             500
3           I005      005                                     10

这是我在下面尝试过的 SELECT 查询，但我无法获得我想要的输出-

SELECT 
    A.ItmNo, A.Code,
    A2.TOTAL SumQtyOnHand,
    B.TOTAL SumQtyOnSale,
    C.TOTAL SumQtyOnPurchase
FROM
    dbo.OnHand A
LEFT JOIN 
    (SELECT ItmNo, Code, SUM(Qty) TOTAL
     FROM dbo.OnHand 
     GROUP BY ItmNo, Code) A2 ON A.ItmNo = A2.ItmNo
LEFT JOIN 
    (SELECT ItmNo, Code, SUM(Qty) TOTAL
     FROM dbo.Sale
     GROUP BY ItmNo, Code) B ON A.ItmNo = A2.ItmNo
LEFT JOIN 
    (SELECT ItmNo, Code, SUM(Qty) TOTAL
     FROM dbo.Purchase
     GROUP BY ItmNo, Code) C ON A.ItmNo = A2.ItmNo

请在 SELECT 查询中提出更正建议以实现上述输出。

提前致谢！

Answer 1

我认为您在预聚合子查询方面走在正确的轨道上。然后，你可以full join。 SQL服务器语法有点繁琐，不支持using()子句：

select 
    coalesce(o.itmno, s.itemno, p.itemno) as itemno,
    coalesce(o.code,  s.code,   p.code) as code,
    o.SumQtyOnHand,
    s.SumQtyOnSale,
    p.SumQtyOnPurchase
from ( 
    select itmno, code, sum(qty) SumQtyOnHand
    from dbo.onhand 
    group by itmno, code
) o
full join (
    select itmno, code, sum(qty) SumQtyOnSale
    from dbo.sale
    group by itmno, code
) s on s.itmno = o.itmno and s.code = o.code
full join ( 
    select itmno, code, sum(qty) SumQtyOnPurchase
    from dbo.purchase
    group by itmno, code
) p on p.itemno = coalesce(s.itemno, o.itemno) and p.code = coalesce(s.code, o.code)

用union all和聚合表示可能更简单：

select itemno, code, 
    sum(qtyOnHand) as SumQtyOnHand, 
    sum(qtyOnSale) as SumQtyOnSale, 
    sum(qtyOnPurchase) as SumQtyOnPurchase
from (
    select itemno, code, qty as qtyOnHand, null as qtyOnSale, null as qtyOnPurchase from dbo.onhand
    union all select itemno, code, null, qty, null from dbo.sale
    union all select itemno, code, null, null, qty from dbo.purchase
) t
group by itemno, code

SELECT 在 SQL 服务器中显示 OnHand、Sale 和 Purchase 表中具有 either/or Qty 字段不为空的所有不同行

SELECT in SQL Server to show all distinct rows from the tables OnHand, Sale and Purchase that have either/or Qty field not empty

sql

sql-server

union

sum

full-outer-join