优化SQL Server查询以提高速度

如何优化SQL Server查询？下面是我想要优化的代码

CREATE TABLE #Temp
(
    TransactionId int PRIMARY KEY,
    TransactionStepId int
) 

INSERT INTO #Temp(TransactionId, TransactionStepId)
    SELECT 
        TransactionId, MAX(TransactionStepId) TransactionStepId
    FROM 
        [WarehouseMgmt].[FactPaymentTrans]  FPT
    JOIN 
        WarehouseMgmt.DimTimeZone DTZ on FPT.[TimeId] = DTZ.TimeUTCId   
    WHERE 
        FactType = 'SOURCE' 
        AND (DTZ.TimeId BETWEEN @DimStartDate AND @DimEndDate)
    GROUP BY 
        TransactionId 

IF(UPPER(@ReportBy) = 'TRANSACTION')
BEGIN
SET @sql = '
    INSERT INTO #Results (      
    [PaymentTypeId],
    [TransactionDate],
    [PaymentMethodId],
    [3DSecureId],
    [ProductId],
    [ProductTypeId],
    [TransactionStatusId],
    [Amount],
    [Currency],
    [PlayerId],
    [PlayerSourceOrigId],
    [Username],
    [FirstName],
    [LastName],
    [BrandId],
    [VIPLevelId],
    [MarketingChannelId],
    [MarketingSourceId],
    [CommentId],
    [CommentRefId],
    [AdminName],
    [OriginalTransactionId],
    [TransactionId],
    [RelatedTransactionId],
    [ProviderTransactionOrigId]
    )
    SELECT
        DTST.[Id],
        FPT.[StartTime],
        FPT.[PaymentMethodId],
        FPT.[3DSecureId],
        FPT.[ProductId],
        DPT.[Id],
        FPT.[TransactionStatusId],
        FPT.[Amount],
        FPT.CurrencyId,
        FPT.[PlayerId],
        DPL.[SourceOrigId],
        DPL.[Username],
        DPL.[FirstName],
        DPL.[LastName],
        DPL.[BrandId],
        DPL.[VIPLevelId],
        DPL.[MarketingChannelId],
        DPL.[MarketingSourceId],
        FPT.[PaymentReasonTextId],
        FPT_Ref.[PaymentReasonTextId],
        FPT.CreatedByAdminId,
        FPT.[OriginalTransactionId],
        FPT.[TransactionId],
        FPT_Ref.[OriginalTransactionId],
        FPT.[ProviderTransactionOrigId]
  FROM WarehouseMgmt.FactPaymentTrans AS FPT        
    JOIN #Temp T ON FPT.TransactionId = T.TransactionId AND FPT.TransactionStepId = T.TransactionStepId
    JOIN WarehouseMgmt.DimTransactionStepType AS DTST ON FPT.[TransactionStepTypeId] = DTST.[Id] 
    JOIN WarehouseMgmt.DimPlayer AS DPL ON FPT.PlayerId = DPL.Id
    JOIN WarehouseMgmt.DimProduct AS DP ON DP.Id = FPT.ProductId
    JOIN WarehouseMgmt.DimProductType AS DPT ON DPT.Id = DP.ProductTypeId
    --JOIN WarehouseMgmt.DimTimeZone DTZ on FPT.[TimeId] = DTZ.TimeUTCId
    JOIN [WarehouseMgmt].[DimLoyaltyProgramLevel] DLPL ON DLPL.[Id]=DPL.VipLevelId      
    LEFT JOIN 
  (
              SELECT FPT_Ref_1.TransactionId,FPT_Ref_1.FactType,FPT_Ref_1.OriginalTransactionId,FPT_Ref_1.[PaymentReasonTextId] 
              FROM WarehouseMgmt.FactPaymentTrans AS FPT_Ref_1                         
              JOIN #Temp T ON T.TransactionId = FPT_Ref_1.OriginalTransactionId AND T.TransactionStepId = FPT_Ref_1.TransactionStepId
   ) AS FPT_Ref ON FPT_Ref.OriginalTransactionId = FPT.TransactionId AND FPT_Ref.FactType = ''SOURCE'' 
  WHERE (FPT.FactType = ''SOURCE'')  ' + @sqlFilters

我试着把这个

            SELECT TransactionId,MAX(TransactionStepId) TransactionStepId
            FROM [WarehouseMgmt].[FactPaymentTrans] 
            WHERE FactType = ''SOURCE'' 
            GROUP BY TransactionId 

在临时表中，但这甚至是没有临时表时最糟糕的情况。我想选择最新的TransactionId（由MAX（TransactionStepId）创建），还想选择左侧连接中的最后一个TransactionId

我的执行计划是：

---

您是否考虑过使用行号而不是两次加入您的表？请尝试以下方法：

;WITH FactPaymentTrans_Last
AS (
    SELECT *, ROW_NUMBER() OVER(PARTITION BY TransactionID ORDER BY TransactionStepID DESC) AS RN
    FROM WarehouseMgmt.FactPaymentTrans
    )
SELECT DTST.[Id]
    , FPT.[StartTime]
    , FPT.[PaymentMethodId]
    , FPT.[3DSecureId]
    , FPT.[ProductId]
    , DPT.[Id]
    , FPT.[TransactionStatusId]
    , FPT.[Amount]
    , FPT.CurrencyId
    , FPT.[PlayerId]
    , DPL.[SourceOrigId]
    , DPL.[Username]
    , DPL.[FirstName]
    , DPL.[LastName]
    , DPL.[BrandId]
    , DPL.[VIPLevelId]
    , DPL.[MarketingChannelId]
    , DPL.[MarketingSourceId]
    , FPT.[PaymentReasonTextId]
    , FPT_Ref.[PaymentReasonTextId]
    , FPT.CreatedByAdminId
    , FPT.[OriginalTransactionId]
    , FPT.[TransactionId]
    , FPT_Ref.[OriginalTransactionId]
    , FPT.[ProviderTransactionOrigId]
FROM FactPaymentTrans_Last AS FPT
INNER JOIN WarehouseMgmt.DimTransactionStepType AS DTST
    ON FPT.[TransactionStepTypeId] = DTST.[Id]
INNER JOIN WarehouseMgmt.DimPlayer AS DPL
    ON FPT.PlayerId = DPL.Id
INNER JOIN WarehouseMgmt.DimProduct AS DP
    ON DP.Id = FPT.ProductId
WHERE FPT.RN = 1;

这只是一个片段，让您了解如何使用它根据其

TransactionStepId

获取最新的

transactionid

如果还不够，请发布以下内容：

你的桌子结构

关于它们的指数

你的执行计划

---

这将有助于为您提供建议。

有多个因素可以提高查询性能，其中一个因素可以做到，而无需了解有关索引、数据库架构、数据分布等的详细信息。这是查询中的

连接的顺序

我已经重构了您的查询，我认为您应该得到与以前相同的结果，但执行时间有所缩短：

SELECT DTST.[Id]
    ,FPT.[StartTime]
    ,FPT.[PaymentMethodId]
    ,FPT.[3DSecureId]
    ,FPT.[ProductId]
    ,DPT.[Id]
    ,FPT.[TransactionStatusId]
    ,FPT.[Amount]
    ,FPT.CurrencyId
    ,FPT.[PlayerId]
    ,DPL.[SourceOrigId]
    ,DPL.[Username]
    ,DPL.[FirstName]
    ,DPL.[LastName]
    ,DPL.[BrandId]
    ,DPL.[VIPLevelId]
    ,DPL.[MarketingChannelId]
    ,DPL.[MarketingSourceId]
    ,FPT.[PaymentReasonTextId]
    ,FPT_Ref.[PaymentReasonTextId]
    ,FPT.CreatedByAdminId
    ,FPT.[OriginalTransactionId]
    ,FPT.[TransactionId]
    ,FPT_Ref.[OriginalTransactionId]
    ,FPT.[ProviderTransactionOrigId]
FROM WarehouseMgmt.FactPaymentTrans AS FPT
INNER JOIN WarehouseMgmt.DimPlayer AS DPL
    ON FPT.PlayerId = DPL.Id
INNER JOIN WarehouseMgmt.DimProduct AS DP
    ON DP.Id = FPT.ProductId
INNER JOIN WarehouseMgmt.DimProductType AS DPT
    ON DPT.Id = DP.ProductTypeId
INNER JOIN WarehouseMgmt.DimTransactionStepType AS DTST
    ON FPT.[TransactionStepTypeId] = DTST.[Id]    
WHERE (FPT.FactType = '' SOURCE '')
    AND EXISTS (SELECT 1
                FROM [WarehouseMgmt].[FactPaymentTrans]
                WHERE FactType = '' SOURCE ''
                    AND FPT.TransactionId = TransactionId
                    AND FPT.TransactionStepId = TransactionStepId)
    AND EXISTS (SELECT 1
                FROM [WarehouseMgmt].[DimLoyaltyProgramLevel] DLPL
                WHERE DLPL.[Id] = DPL.VipLevelId)
    AND EXISTS (SELECT 1
                FROM WarehouseMgmt.DimTimeZone DTZ
                WHERE FPT.[TimeId] = DTZ.TimeUTCId
                    AND DTZ.TimeId BETWEEN @DimStartDate AND @DimEndDate)

您可以共享一个执行计划吗？关于表上索引的详细信息？另外，在查询的末尾有一个小撇号。这有什么意义吗（可能是缺少一些代码？）或者这是一个错误？您可以尝试我的查询，看看执行时间是否有任何改进吗？我在问题中添加了执行计划。首先，您没有FPT_Ref表，其次，您无法筛选时间，然后在该表上进行联接。它返回错误。请查看我的代码并更改为same@user2171512这个想法是，这不是苏假定是相同的（某些查询是多余的）。我已对查询进行了更正，以便筛选器能够使用“时间内”。请尝试新查询。我的FPT_Ref。[PaymentReasonTextId]和FPT_Ref。[OriginalTransactionId]仍有错误。这是我的引用表（联接表）。我如何才能将其修复为与以前一样？@user2171512好的，我现在知道我错过了什么。您有关于优化的新解决方案吗？