Question

是否可以在连接的上下文中引用内部查询的外部查询？内部查询的“where（sid.ItemID = i.itemID）”给了我一个错误。我以为我过去做过这个，所以我搜索了所有存储的过程，但显然我做了一些替换来让它工作。我怀疑我可以删除那一行并且它会起作用但是它对内部where子句更有效吗？

SELECT departmentName
       , supplierName
       , so.SalesOrderID
       , ss.warehouseInvoiceNo
       , ss.transactionNo
       , ss.storeID
       , s.storeName
       , s.storeNo
       , tr.transactionDate
       , p.period
       , sooos.salesOrderID
       , sooos.salesOrderOutOfStockID
       , sooos.itemID
       , i.itemNo
       , i.itemName
       , i.pack
       , i.unitSize
       , quantity
       , wi.available
FROM   SalesOrderOutOfStock sooos
       JOIN Item AS i ON i.ItemID = sooos.ItemID
       JOIN SalesOrder so ON so.SalesOrderID = sooos.SalesOrderID
       JOIN WarehouseInventory wi ON wi.ItemID = sooos.ItemID
       JOIN Store s ON s.StoreID = so.StoreID
       JOIN InvoiceOrderRelationship ior ON ior.SalesOrderID = so.SalesOrderID
       JOIN StockSale ss ON ss.WarehouseInvoiceNo = ior.WarehouseInvoiceNo
       JOIN TransactionRegister tr ON tr.TransactionNo = ss.TransactionNo
       JOIN Period p ON p.PeriodID = tr.PeriodID
       JOIN Department d ON d.DepartmentID = i.DepartmentID
       LEFT OUTER JOIN (SELECT TOP 1 itemID
                                     , supplierID
                        FROM   SupplierInvoiceDetail sid
                               JOIN SupplierInvoice si ON si.SupplierInvoiceID = sid.SupplierInvoiceID
                       --where (sid.ItemID = i.itemID) 
                       order by InvoiceDate desc 
                       --NEED AN ORDER BY HERE
                       ) AS lastSupplier ON lastSupplier.ItemID = i.ItemID
       JOIN supplier su ON su.SupplierID = Isnull(lastSupplier.supplierID, i.supplierID)
WHERE  ss.WarehouseInvoiceNo = 10000000

- $ P {invoiceNo}

Answer 1

您需要在此使用OUTER APPLY而不是LEFT JOIN：

OUTER APPLY (SELECT TOP 1 itemID
                                 , supplierID
                    FROM   SupplierInvoiceDetail sid
                           JOIN SupplierInvoice si ON si.SupplierInvoiceID = sid.SupplierInvoiceID
                   where (sid.ItemID = i.itemID) order by InvoiceDate desc 
                   ) AS lastSupplier

FROM或JOIN子句中引入的子查询不能引用同一FROM子句中的其他表源（实际上，它们都应该可以同时评估）。 APPLY允许您在评估中引入特定的依赖关系。

SQLServer引用外部查询

1 个答案: