我正在尝试创建一个视图，其中用户看到每个“批处理”加入一行，这样当来自不同表的“批处理”匹配时 - 那么它们应该一起作为一行。但是如果任何一个表本身都有“批处理”，那么它也应该作为一行添加到其他列中的“NULL”行。
我认为问题在于如何加入表格。但我无法弄清楚这个问题。
CREATE TABLE #ItemTable ([Item] nvarchar(16))
CREATE TABLE #LocationTable ([Item] nvarchar(16), [Batch] nvarchar(32), [Location] nvarchar(13), [Quantity] int)
CREATE TABLE #OrderTable ([Item] nvarchar(16), [Batch] nvarchar(32), [Quantity] int)
CREATE TABLE #BookingTable ([Item] nvarchar(16), [Batch] nvarchar(32), [Quantity] int)
--------------------------------------------------------------------------------------------------
-- CURRENT RESULT:
--------------------------------------------------------------------------------------------------
-- Item Batch Location QuantityOnLocation OrderedQuantity BookedQuantity
-- 1000 1 Location_1 10 NULL NULL
-- 1000 22 Location_2 10 NULL NULL
-- 2000 333 Location_3 0 10 NULL
-- 2000 4444 Location_4 10 NULL NULL
-- 3000 666666 NULL NULL 10 10
--------------------------------------------------------------------------------------------------
-- DESIRED RESULT:
--------------------------------------------------------------------------------------------------
-- Item Batch Location QuantityOnLocation OrderedQuantity BookedQuantity
-- 1000 1 Location_1 10 NULL 10
-- 1000 22 Location_2 10 NULL 0
-- 1000 55555 NULL NULL NULL 10
-- 2000 333 Location_3 0 10 NULL
-- 2000 4444 Location_4 10 NULL NULL
-- 3000 666666 NULL NULL 10 10
INSERT INTO #ItemTable ([Item]) VALUES
('1000'),
('2000'),
('3000')
INSERT INTO #LocationTable ([Item], [Batch], [Location], [Quantity]) VALUES
('1000', '1', 'Location_1', 10),
('1000', '22', 'Location_2', 10),
('2000', '333', 'Location_3', 0),
('2000', '4444', 'Location_4', 10)
INSERT INTO #OrderTable ([Item], [Batch], [Quantity]) VALUES
('2000', '333', 10),
('3000', '666666', 10)
INSERT INTO #BookingTable ([Item], [Batch], [Quantity]) VALUES
('1000', '1', 10),
('1000', '55555', 10),
('3000', '666666', 10)
SELECT
[Item].[Item] AS [Item],
COALESCE([Location].[Batch], [Order].[Batch], [Booking].[Batch]) AS [Batch],
[Location].[Location] AS [Location],
[Location].[Quantity] AS [QuantityOnLocation],
[Order].[Quantity] AS [OrderedQuantity],
[Booking].Quantity AS [BookedQuantity]
FROM
#ItemTable AS [Item]
LEFT OUTER JOIN (
SELECT [Item], [Quantity], [Batch], [Location]
FROM #LocationTable)
AS [Location] ON [Location].[Item] = [Item].[Item]
LEFT OUTER JOIN (
SELECT [Item], [Quantity], [Batch]
FROM #OrderTable)
AS [Order] ON [Order].[Item] = [Item].[Item]
AND ISNULL([Order].[Batch], '') = ISNULL([Location].[Batch], [Order].[Batch])
LEFT OUTER JOIN (
SELECT [Item], [Quantity], [Batch]
FROM #BookingTable)
AS [Booking] ON [Order].[Item] = [Item].[Item]
AND ISNULL([Booking].[Batch], '') = COALESCE([Location].[Batch], [Order].[Batch], [Booking].[Batch])
WHERE
ISNULL([Location].[Quantity], 0) <> 0
OR ISNULL([Order].[Quantity], 0) <> 0
OR ISNULL([Booking].Quantity, 0) <> 0
DROP TABLE #ItemTable
DROP TABLE #LocationTable
DROP TABLE #BookingTable
DROP TABLE #OrderTable
答案 0 :(得分：3)
你在上一次加入时输入了一个拼写错误（我认为），这一点：
LEFT OUTER JOIN (
SELECT [Item], [Quantity], [Batch]
FROM #BookingTable)
AS [Booking] ON [Order].[Item] = [Item].[Item]
不应该是：
ON [Booking].[Item] = [Item].[Item]
我稍微改写了你的查询：
SELECT
i.Item AS Item,
COALESCE(l.Batch, o.Batch, b.Batch) AS Batch,
l.Location AS Location,
l.Quantity AS QuantityOnLocation,
o.Quantity AS OrderedQuantity,
b.Quantity AS BookedQuantity
FROM
#ItemTable i
LEFT JOIN #LocationTable l ON l.Item = i.Item
LEFT JOIN #OrderTable o ON o.Item = i.Item AND o.Batch = ISNULL(l.Batch, o.Batch)
LEFT JOIN #BookingTable b ON b.Item = i.Item AND b.Batch = COALESCE(l.Batch, o.Batch, b.Batch)
WHERE
ISNULL(l.Quantity, 0) != 0
OR ISNULL(o.Quantity, 0) != 0
OR ISNULL(b.Quantity, 0) != 0;
这对我来说似乎更具可读性，但我想这是个人偏好？
然后我意识到这仍然没有给你你想要的东西，所以我再次重构它以获得这个（这确实给你想要的结果）：
WITH UniqueItemBatch AS (
SELECT DISTINCT Item, Batch FROM #LocationTable
UNION
SELECT DISTINCT Item, Batch FROM #OrderTable
UNION
SELECT DISTINCT Item, Batch FROM #BookingTable)
SELECT
u.Item AS Item,
u.Batch,
l.Location AS Location,
l.Quantity AS QuantityOnLocation,
o.Quantity AS OrderedQuantity,
b.Quantity AS BookedQuantity
FROM
UniqueItemBatch u
LEFT JOIN #ItemTable i ON i.Item = u.Item
LEFT JOIN #LocationTable l ON l.Item = u.Item AND l.Batch = u.Batch
LEFT JOIN #OrderTable o ON o.Item = u.Item AND o.Batch = u.Batch
LEFT JOIN #BookingTable b ON b.Item = u.Item AND b.Batch = u.Batch
WHERE
ISNULL(l.Quantity, 0) != 0
OR ISNULL(o.Quantity, 0) != 0
OR ISNULL(b.Quantity, 0) != 0;
答案 1 :(得分：1)
我不确定最后一列的逻辑，但这会为其他列提供所需的结果。
要根据显示为批处理的预订或位置获取查询，我已在查询中将两个表联合在一起。
如果可能，我会建议您重新审视数据结构的设计
select
item.Item,
batch.Batch,
max(batch.location) as location,
sum(batch.LQuantity) as QuantityOnLocation,
orders.Quantity as OrderedQuantity,
sum(batch.BQuantity) as BookedQuantity
from
#ItemTable item
left join
(
select Item, Batch, quantity as BQuantity, null as Location, null as LQuantity from #BookingTable
union
select item, Batch, null, Location, Quantity as LQuantity from #LocationTable
) batch
on item.Item = batch.Item
left join #OrderTable orders
on item.Item = orders.Item and batch.Batch = orders.Batch
group by
item.Item,
batch.Batch,
orders.Quantity
答案 2 :(得分：-1)
我想我更喜欢不同的方法。如何将所有的batchnumber都添加为空列并添加所有列。然后从每个表中更新不同的列。
像这样：
SELECT INTO #MyTableResult Batch FROM TableA
UNION
SELECT Batch FROM TableB
等等。联盟删除了重复项。
然后你更新如下：
Update #MyTableResult SET Column A = ValueA FROM TableA WHERE
#MyTableResult.Batch = TableA.Batch.
完成表格的所有更新后，您将获得所需的结果。