如何合并两个查询？

Question

我需要结合以下两个查询...

SELECT     Products.ProductId, Products.ProductDescription, SUM(Inventory.QuantityOutstanding) AS Inventory, Products.AverageCost AS Cost

FROM         Products INNER JOIN
                  Inventory ON Products.Product = Inventory.Product
WHERE    (Inventory > 0) AND (Products.ProductId LIKE 'CAS%') OR
                  (Products.ProductId LIKE 'ASY%')
GROUP BY Products.ProductId, Products.ProductDescription, Products.AverageCost
ORDER BY Products.ProductId

这给出了像...的表格

ProductID    ProductDescription    Inventory    Cost
-------------------------------------------------------
   AB            CD                  0???       0
   UV            XY                    5        555
   .             .                     .         .
   .             .                     .         .
   .             .                     .         .

和

SELECT Components.ProductId, SUM(SalesOrderItems.QuantityOutstanding) AS Schedule

FROM Structures INNER JOIN
Products AS Components ON  Structures.Component = Components.Product INNER JOIN
Products AS Products ON Products.Product = Structures.Product AND 
Structures.StructureVersion = Products.StructureVersion LEFT OUTER JOIN
SalesOrders INNER JOIN
SalesOrderItems ON SalesOrders.SalesOrder = SalesOrderItems.SalesOrder ON 
Products.Product = SalesOrderItems.Product


WHERE      ((Components.ProductId LIKE 'CAS%') OR (Components.ProductId LIKE 'ASY%')) AND (SalesOrderItems.DueDate < DATEADD(m, 3, GETDATE())) AND (SalesOrderItems.QuantityOutstanding > 0)
GROUP BY Components.ProductId, Products.ProductId
ORDER BY Components.ProductId

这给出了像...的表格

ProductId      Schedule
-------------------------
  AB             360
  UV             3
   .             .
   .             .
   .             .

我基本上想要一个表来显示ProductId，（库存-计划）AS XSStock和这样的成本...

ProductId    XSStock (>0 only)    Cost
-------------------------------------------
   UV             2                222
   .              .                 .
   .              .                 .
   .              .                 .

我以为这可能是UNION或子查询，但是我似乎无法使它们正常工作？

我最近才开始使用SQL，因此，如果您能解释一下您的回答，那就太好了！

卡蒂亚编辑查询：

SELECT ProductId, ProductDescription, Inventory, Cost, SUM(Orders) AS Demand, (Inventory - SUM(Orders)) AS XSStock

FROM (SELECT X.ProductId, X.ProductDescription, X.Inventory, X.Cost, SUM(Y.Schedule) AS Orders

    FROM (SELECT     Products.ProductId, Products.ProductDescription, SUM(Inventory.QuantityOutstanding) AS Inventory, Products.AverageCost AS Cost

        FROM         Products INNER JOIN
                            Inventory ON Products.Product = Inventory.Product
        WHERE     (Products.ProductId LIKE 'CAS%') OR
                            (Products.ProductId LIKE 'ASY%')
        GROUP BY Products.ProductId, Products.ProductDescription, Products.AverageCost) AS X, 

    (SELECT Components.ProductId, SUM(SalesOrderItems.QuantityOutstanding) AS Schedule

        FROM Structures INNER JOIN
        Products AS Components ON  Structures.Component = Components.Product INNER JOIN
        Products AS Products ON Products.Product = Structures.Product AND 
        Structures.StructureVersion = Products.StructureVersion LEFT OUTER JOIN
                SalesOrders INNER JOIN
        SalesOrderItems ON SalesOrders.SalesOrder = SalesOrderItems.SalesOrder ON 
        Products.Product = SalesOrderItems.Product

    WHERE      ((Components.ProductId LIKE 'CAS%') OR (Components.ProductId LIKE 'ASY%')) AND (SalesOrderItems.DueDate < DATEADD(m, 3, GETDATE())) AND (SalesOrderItems.QuantityOutstanding > 0)
    GROUP BY Components.ProductId, Products.ProductId) AS Y


WHERE (Y.ProductId LIKE X.ProductId)
GROUP BY X.ProductId, X.ProductDescription, X.Inventory, X.Cost)

WHERE ((Inventory - SUM(Orders)) > 0)
GROUP BY ProductId, ProductDescription, Inventory, Cost

ORDER BY ProductId

我现在收到错误消息...

Incorrect syntax near the keyword 'WHERE'

这是第30行，但我不知道为什么？

Answer 1

您也可以尝试对两个查询都使用别名并在选择查询中选择它们

SELECT x.a, y.b FROM (SELECT * from a) as x, (SELECT * FROM b) as y

Answer 2

要修复Inventory = 0您只需要在此处添加括号：

`(Inventory > 0) AND *((Products.ProductId LIKE 'CAS%') OR (Products.ProductId LIKE 'ASY%'))`

关于查询：您为什么不想从“产品”中进行选择并加入其中的所有内容？ 您在所有表中都有ProductsId。 我尝试将其合并为一个，也许它将对您有所帮助：

SELECT     Products.ProductId, Products.ProductDescription, SUM(Inventory.QuantityOutstanding) AS Inventory, Products.AverageCost AS Cost
 SUM(SalesOrderItems.QuantityOutstanding) AS Schedule
from Products

inner join Inventory ON Products.Product = Inventory.Product
inner join structures AS Components ON  Structures.Component = Products.Product INNER JOIN
inner join structurs as structures.Product = Product.Product and
Structures.StructureVersion = Products.StructureVersion 
LEFT OUTER JOIN
SalesOrders INNER JOIN SalesOrderItems ON SalesOrders.SalesOrder = SalesOrderItems.SalesOrder ON 
Products.Product = SalesOrderItems.Product
WHERE    (Inventory > 0) AND ((Products.ProductId LIKE 'CAS%') OR (Products.ProductId LIKE 'ASY%'))
and  ((Products.ProductId LIKE 'CAS%') OR (Products.ProductId LIKE 'ASY%')) 
AND (SalesOrderItems.DueDate < DATEADD(m, 3, GETDATE())) AND (SalesOrderItems.QuantityOutstanding > 0)

GROUP BY Products.ProductId, Products.ProductDescription, Products.AverageCost
ORDER BY Products.ProductId