爲每個提取的記錄計算其他表上的聚合 - 性能

我正在使用多個連接進行查詢。對於一個「加入」表有一對多關聯，我需要在這一個上進行聚合（SUM）。爲每個提取的記錄計算其他表上的聚合 - 性能

我在每個查詢執行時獲得了大約500到1000條記錄。大約需要100到200毫秒（它有很多連接）。但是在添加聚合之後，它將執行時間增加到大約5-6秒！

我試過2個解決方案（問題是與最後兩米欄：SubchargesTo和SubchargesFrom），無論是在性能惡化的一大因素：

第一：

SELECT 
      RR.Id, 
      Customer.Name AS Customer, 
      PrincipalsCustomer.Name AS PrincipalsCustomer, 
      EffectiveCarrier.Name AS EffectiveCarrier, 
      CAST(CASE RR.isImport WHEN 1 THEN RR.unloadingDateStart ELSE TR.loadingDateStart END AS DATE) AS LoadingUnloadingDate, 
      RR.containerNo AS ContainerNumber, 
      CASE RR.isImport WHEN 1 THEN PLACEUNLOADING.Name ELSE PlaceLoading.Name END AS LoadingUnloadingPlace, 
      Pol.Name AS POL, 
      Pod.Name AS POD, 
      Commodity.Name AS Commodity, 
      RR.Km AS Km, 
      RR.pricePerKm AS SalesPricePerKM, 
      RR.salesPrice AS SalesPrice, 
      RR.purchasePrice AS PurchasePrice 
      (SELECT SUM(salesAmount*salesCost) FROM TruckingTobaccoSurcharges WHERE TruckingTobaccoSurcharges.REPORT = RR.Id) + 
      (SELECT SUM(incomeAmount*toSBCIncome) FROM TruckingTobaccoSurcharges2 WHERE TruckingTobaccoSurcharges2.REPORT = RR.Id) as SurchargesTo, 
      (SELECT SUM(costAmount*costCost) FROM TruckingTobaccoSurcharges WHERE TruckingTobaccoSurcharges.REPORT = RR.Id) + 
      (SELECT SUM(costAmount*fromCustomerCost) FROM TruckingTobaccoSurcharges2 WHERE TruckingTobaccoSurcharges2.REPORT = RR.Id) as SurchargesFrom 
     FROM Report RR 
      JOIN TruckingReport TR ON TR.REPORT = RR.ID 
      LEFT JOIN Customer ON RR.CUSTOMER = Customer.ID 
      LEFT JOIN PrincipalsCustomer ON RR.PRINCIPALSCUSTOMER = PrincipalsCustomer.ID 
      LEFT JOIN EffectiveCarrier ON RR.EFFECTIVECARRIER = EffectiveCarrier.ID 
      LEFT JOIN PlaceLoading ON TR.PLACELOADING = PlaceLoading.ID 
      LEFT JOIN PlaceUnloading ON RR.PLACEUNLOADING = PlaceUnloading.ID 
      LEFT JOIN Pol ON TR.POL = Pol.Id 
      LEFT JOIN Pod ON TR.POD = Pod.Id 
      LEFT JOIN Commodity ON RR.COMMODITY = Commodity.Id

的第二個：

SELECT 
      RR.Id, 
      Customer.Name AS Customer, 
      PrincipalsCustomer.Name AS PrincipalsCustomer, 
      EffectiveCarrier.Name AS EffectiveCarrier, 
      CAST(CASE RR.isImport WHEN 1 THEN RR.unloadingDateStart ELSE TR.loadingDateStart END AS DATE) AS LoadingUnloadingDate, 
      RR.containerNo AS ContainerNumber, 
      CASE RR.isImport WHEN 1 THEN PLACEUNLOADING.Name ELSE PlaceLoading.Name END AS LoadingUnloadingPlace, 
      Pol.Name AS POL, 
      Pod.Name AS POD, 
      Commodity.Name AS Commodity, 
      RR.Km AS Km, 
      RR.pricePerKm AS SalesPricePerKM, 
      RR.salesPrice AS SalesPrice, 
      RR.purchasePrice AS PurchasePrice, 
      SUBCH1.sales + SUBCH2.sales AS SurchargesTo, 
      SUBCH1.costs + SUBCH2.costs AS SurchargesFrom 
     FROM Report RR 
      JOIN TruckingReport TR ON TR.REPORT = RR.ID 
      LEFT JOIN Customer ON RR.CUSTOMER = Customer.ID 
      LEFT JOIN PrincipalsCustomer ON RR.PRINCIPALSCUSTOMER = PrincipalsCustomer.ID 
      LEFT JOIN EffectiveCarrier ON RR.EFFECTIVECARRIER = EffectiveCarrier.ID 
      LEFT JOIN PlaceLoading ON TR.PLACELOADING = PlaceLoading.ID 
      LEFT JOIN PlaceUnloading ON RR.PLACEUNLOADING = PlaceUnloading.ID 
      LEFT JOIN Pol ON TR.POL = Pol.Id 
      LEFT JOIN Pod ON TR.POD = Pod.Id 
      LEFT JOIN Commodity ON RR.COMMODITY = Commodity.Id 
      LEFT JOIN (SELECT REPORT, SUM(salesAmount*salesCost) AS sales, SUM(costAmount*costCost) AS costs 
         FROM TruckingTobaccoSurcharges SR1 GROUP BY SR1.REPORT 
         )AS SUBCH1 ON SUBCH1.REPORT = RR.ID 
      LEFT JOIN (SELECT REPORT, SUM(incomeAmount*toSBCIncome) AS sales, SUM(costAmount*fromCustomerCost) AS costs 
         FROM TruckingTobaccoSurcharges2 SR2 GROUP BY SR2.REPORT 
         )AS SUBCH2 ON SUBCH2.REPORT = RR.ID

有什麼更快的方法來實現所需結果呢？或者這麼多的連接不能真正讓它更快？

任何幫助表示讚賞=]

編輯：作爲尼古拉Markovinović提示再次快速使它TruckingTobaccoSurcharges表上報告FK

新增指數（使用溶液1）！雖然沒有嘗試過解決方案2。仍然我想知道如果我的查詢可能會更好，因爲其他人聲明我不加入，但subquerying ...

來源

2013-04-12 mbudnik

第2版，似乎沒什麼問題。兩個表中的報告都有索引嗎？ –

嗯。我還沒有在索引中，但在擴展報表上的「索引」後，我有「PK_Report（Clustered）」。 – mbudnik

「報告」欄中的「TruckingTobaccoSurcharges」和「TruckingTobaccoSurcharges2」需要索引。使用[sp_helpidex]（http://technet.microsoft.com/en-us/library/ms188771%28v=sql.105%29.aspx）檢查索引。 'sp_helpindex'TruckingTobaccoSurcharges''將顯示此表中的所有索引。如果您在index_keys下沒有看到「報告」作爲起始字段，則需要添加索引：「創建索引ix_TruckingTobaccoSurcharges_Report on TruckingTobaccoSurcharges（報告）」。對於TruckingTobaccoSurcharges2也是如此。如果你需要速度，你必須掌握索引。 –

你必須意識到，你沒有加入！
是的，你正在加入，因爲左邊是所有的地方，但實際上不是，這不是你的問題。
你是subquerying檢索你的總和，這是壞的，壞的和壞的。 Subquerying總是慢於加入。

這是一個子查詢，而不是加入：

LEFT JOIN 
( 
    SELECT REPORT, 
      SUM(salesAmount*salesCost) AS sales, 
      SUM(costAmount*costCost) AS costs 
    FROM TruckingTobaccoSurcharges SR1 GROUP BY SR1.REPORT 
)

因爲你subquerying，在報告索引不使用，所以進展緩慢。

因此，對於你的問題，這裏是應該工作：（要知道，真正的加入！）

SELECT 
    SUM(s.salesAmount * s.salesCost) + SUM(s2.salesAmount * s2.salesCost) AS SurchargesTo, 
    SUM(s.costAmount * s.costCost) + SUM(s2.costAmount * s2.fromCustomerCost) AS SurchargesFrom 
FROM Report RR 
    LEFT JOIN TruckingTobaccoSurcharges s 
     ON s.REPORT = RR.ID 
    LEFT JOIN TruckingTobaccoSurcharges2 ss 
     ON s.REPORT = RR.ID 
GROUP BY s.REPORT

來源

2013-04-12 10:07:31

謝謝！ =]，讓我試試這個。 – mbudnik

此版本可能會在「TruckingTobaccoSurcharges」和「TruckingTobaccoSurcharges2」之間生成笛卡爾積，除非其中一個表不包含匹配記錄。總計將關閉。 –

我不能在我的查詢中注入您的解決方案，因爲我無法在一個結果中獲得聚合和表列。我應該分組所有其他列嗎？ – mbudnik

爲每個提取的記錄計算其他表上的聚合 - 性能

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