Невозможно создать индексированный вид в SQL Server

Мне не удается создать кластерный индекс в моем представлении для производной таблицы.Невозможно создать индексированный вид в SQL Server

Пожалуйста, помогите мне оптимизировать мой взгляд, где я могу создать индекс в качестве своего требования к оптимизации. Если индексирование невозможно для моего случая, пожалуйста, помогите мне написать более быстрый просмотр.

Вот мой код:

ALTER VIEW [dbo].[VW_FGDOrderByMaxTimeAdded] 
WITH SCHEMABINDING 
AS 
    SELECT t.id, 
      t.Customer, 
      t.Scanner, 
      t.custType, 
      FDGOrder, 
      StatusID, 
      TimeAdded, 
      cntID, 
      empID, 
      effectChildren 
    FROM dbo.smsFDGOrder t 
    INNER JOIN dbo.smsFDGOrderStatus ON t.id = dbo.smsFDGOrderStatus.FDGOrder 
    INNER JOIN (
     SELECT smsFDGOrder.id, 
       MAX(DISTINCT TimeAdded) AS MAX_TIME 
     FROM dbo.smsFDGOrder AS smsFDGOrder 
     INNER JOIN dbo.smsFDGOrderStatus ON smsFDGOrder.id = FDGOrder 
     GROUP BY smsFDGOrder.id 
    ) a ON a.id = t.id 
     AND a.MAX_TIME = TimeAdded

Я пытался добавить индекс к этому:

CREATE UNIQUE CLUSTERED INDEX IDX_VW_FGDOrderByMaxTimeAdded_ID 
    ON dbo.VW_FGDOrderByMaxTimeAdded (id);

но получил ошибку: План

Msg 10109, Level 16, State 1, Line 1
Cannot create index on view "sharedmsdb-LIVE.dbo.VW_FGDOrderByMaxTimeAdded" because it references derived table "a" (defined by SELECT statement in FROM clause).
Consider removing the reference to the derived table or not indexing the view.

Execution для Devart Ответ:

<?xml version="1.0" encoding="utf-16"?> 
<ShowPlanXML xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" Version="1.2" Build="11.0.5343.0" xmlns="http://schemas.microsoft.com/sqlserver/2004/07/showplan"> 
    <BatchSequence> 
    <Batch> 
     <Statements> 
     <StmtSimple StatementCompId="1" StatementId="1" StatementText="CREATE /*UNIQUE*/ NONCLUSTERED INDEX ixd ON dbo.smsFDGOrderStatus (FDGOrder, TimeAdded DESC)&#xD;&#xA;" StatementType="CREATE INDEX" RetrievedFromCache="false" /> 
     </Statements> 
    </Batch> 
    <Batch> 
     <Statements> 
     <StmtSimple StatementCompId="1" StatementEstRows="72653.9" StatementId="1" StatementOptmLevel="FULL" StatementSubTreeCost="10.5795" StatementText="&#xD;&#xA;SELECT t.id,&#xD;&#xA;  t.Customer,&#xD;&#xA;  t.Scanner,&#xD;&#xA;  t.custType,&#xD;&#xA;  s.FDGOrder,&#xD;&#xA;  s.StatusID,&#xD;&#xA;  s.TimeAdded,&#xD;&#xA;  s.cntID,&#xD;&#xA;  s.empID,&#xD;&#xA;  s.effectChildren&#xD;&#xA;FROM dbo.smsFDGOrder t&#xD;&#xA;JOIN dbo.smsFDGOrderStatus s ON t.id = s.FDGOrder&#xD;&#xA;JOIN (&#xD;&#xA; SELECT FDGOrder, MAX(TimeAdded) AS MAX_TIME&#xD;&#xA; FROM dbo.smsFDGOrderStatus&#xD;&#xA; GROUP BY FDGOrder&#xD;&#xA;) a ON a.FDGOrder = s.FDGOrder&#xD;&#xA; AND a.MAX_TIME = TimeAdded" StatementType="SELECT" QueryHash="0x75C062BEC9148C5B" QueryPlanHash="0xF019E4D78D6C40" RetrievedFromCache="true"> 
      <StatementSetOptions ANSI_NULLS="true" ANSI_PADDING="true" ANSI_WARNINGS="true" ARITHABORT="true" CONCAT_NULL_YIELDS_NULL="true" NUMERIC_ROUNDABORT="false" QUOTED_IDENTIFIER="true" /> 
      <QueryPlan NonParallelPlanReason="NoParallelPlansInDesktopOrExpressEdition" CachedPlanSize="32" CompileTime="36" CompileCPU="36" CompileMemory="488"> 
      <MemoryGrantInfo SerialRequiredMemory="0" SerialDesiredMemory="0" /> 
      <OptimizerHardwareDependentProperties EstimatedAvailableMemoryGrant="102297" EstimatedPagesCached="7864" EstimatedAvailableDegreeOfParallelism="2" /> 
      <RelOp AvgRowSize="49" EstimateCPU="0.317657" EstimateIO="0" EstimateRebinds="0" EstimateRewinds="0" EstimatedExecutionMode="Row" EstimateRows="72653.9" LogicalOp="Inner Join" NodeId="0" Parallel="false" PhysicalOp="Merge Join" EstimatedTotalSubtreeCost="10.5795"> 
       <OutputList> 
       <ColumnReference Database="[sharedmsdb-LIVE]" Schema="[dbo]" Table="[smsFDGOrder]" Alias="[t]" Column="ID" /> 
       <ColumnReference Database="[sharedmsdb-LIVE]" Schema="[dbo]" Table="[smsFDGOrder]" Alias="[t]" Column="Customer" /> 
       <ColumnReference Database="[sharedmsdb-LIVE]" Schema="[dbo]" Table="[smsFDGOrder]" Alias="[t]" Column="Scanner" /> 
       <ColumnReference Database="[sharedmsdb-LIVE]" Schema="[dbo]" Table="[smsFDGOrder]" Alias="[t]" Column="custType" /> 
       <ColumnReference Database="[sharedmsdb-LIVE]" Schema="[dbo]" Table="[smsFDGOrderStatus]" Alias="[s]" Column="FDGOrder" /> 
       <ColumnReference Database="[sharedmsdb-LIVE]" Schema="[dbo]" Table="[smsFDGOrderStatus]" Alias="[s]" Column="StatusID" /> 
       <ColumnReference Database="[sharedmsdb-LIVE]" Schema="[dbo]" Table="[smsFDGOrderStatus]" Alias="[s]" Column="TimeAdded" /> 
       <ColumnReference Database="[sharedmsdb-LIVE]" Schema="[dbo]" Table="[smsFDGOrderStatus]" Alias="[s]" Column="cntID" /> 
       <ColumnReference Database="[sharedmsdb-LIVE]" Schema="[dbo]" Table="[smsFDGOrderStatus]" Alias="[s]" Column="empID" /> 
       <ColumnReference Database="[sharedmsdb-LIVE]" Schema="[dbo]" Table="[smsFDGOrderStatus]" Alias="[s]" Column="effectChildren" /> 
       </OutputList> 
       <Merge ManyToMany="false"> 
       <InnerSideJoinColumns> 
        <ColumnReference Database="[sharedmsdb-LIVE]" Schema="[dbo]" Table="[smsFDGOrderStatus]" Column="FDGOrder" /> 
       </InnerSideJoinColumns> 
       <OuterSideJoinColumns> 
        <ColumnReference Database="[sharedmsdb-LIVE]" Schema="[dbo]" Table="[smsFDGOrder]" Alias="[t]" Column="ID" /> 
       </OuterSideJoinColumns> 
       <Residual> 
        <ScalarOperator ScalarString="[sharedmsdb-LIVE].[dbo].[smsFDGOrder].[ID] as [t].[ID]=[sharedmsdb-LIVE].[dbo].[smsFDGOrderStatus].[FDGOrder]"> 
        <Compare CompareOp="EQ"> 
         <ScalarOperator> 
         <Identifier> 
          <ColumnReference Database="[sharedmsdb-LIVE]" Schema="[dbo]" Table="[smsFDGOrder]" Alias="[t]" Column="ID" /> 
         </Identifier> 
         </ScalarOperator> 
         <ScalarOperator> 
         <Identifier> 
          <ColumnReference Database="[sharedmsdb-LIVE]" Schema="[dbo]" Table="[smsFDGOrderStatus]" Column="FDGOrder" /> 
         </Identifier> 
         </ScalarOperator> 
        </Compare> 
        </ScalarOperator> 
       </Residual> 
       <RelOp AvgRowSize="23" EstimateCPU="0.0798894" EstimateIO="0.193495" EstimateRebinds="0" EstimateRewinds="0" EstimatedExecutionMode="Row" EstimateRows="72484" LogicalOp="Clustered Index Scan" NodeId="1" Parallel="false" PhysicalOp="Clustered Index Scan" EstimatedTotalSubtreeCost="0.273385" TableCardinality="72484"> 
        <OutputList> 
        <ColumnReference Database="[sharedmsdb-LIVE]" Schema="[dbo]" Table="[smsFDGOrder]" Alias="[t]" Column="ID" /> 
        <ColumnReference Database="[sharedmsdb-LIVE]" Schema="[dbo]" Table="[smsFDGOrder]" Alias="[t]" Column="Customer" /> 
        <ColumnReference Database="[sharedmsdb-LIVE]" Schema="[dbo]" Table="[smsFDGOrder]" Alias="[t]" Column="Scanner" /> 
        <ColumnReference Database="[sharedmsdb-LIVE]" Schema="[dbo]" Table="[smsFDGOrder]" Alias="[t]" Column="custType" /> 
        </OutputList> 
        <IndexScan Ordered="true" ScanDirection="FORWARD" ForcedIndex="false" ForceSeek="false" ForceScan="false" NoExpandHint="false" Storage="RowStore"> 
        <DefinedValues> 
         <DefinedValue> 
         <ColumnReference Database="[sharedmsdb-LIVE]" Schema="[dbo]" Table="[smsFDGOrder]" Alias="[t]" Column="ID" /> 
         </DefinedValue> 
         <DefinedValue> 
         <ColumnReference Database="[sharedmsdb-LIVE]" Schema="[dbo]" Table="[smsFDGOrder]" Alias="[t]" Column="Customer" /> 
         </DefinedValue> 
         <DefinedValue> 
         <ColumnReference Database="[sharedmsdb-LIVE]" Schema="[dbo]" Table="[smsFDGOrder]" Alias="[t]" Column="Scanner" /> 
         </DefinedValue> 
         <DefinedValue> 
         <ColumnReference Database="[sharedmsdb-LIVE]" Schema="[dbo]" Table="[smsFDGOrder]" Alias="[t]" Column="custType" /> 
         </DefinedValue> 
        </DefinedValues> 
        <Object Database="[sharedmsdb-LIVE]" Schema="[dbo]" Table="[smsFDGOrder]" Index="[PK_FDGOrder]" Alias="[t]" IndexKind="Clustered" /> 
        </IndexScan> 
       </RelOp> 
       <RelOp AvgRowSize="36" EstimateCPU="1.67094" EstimateIO="0" EstimateRebinds="0" EstimateRewinds="0" EstimatedExecutionMode="Row" EstimateRows="72654.8" LogicalOp="Inner Join" NodeId="2" Parallel="false" PhysicalOp="Merge Join" EstimatedTotalSubtreeCost="9.9885"> 
        <OutputList> 
        <ColumnReference Database="[sharedmsdb-LIVE]" Schema="[dbo]" Table="[smsFDGOrderStatus]" Alias="[s]" Column="FDGOrder" /> 
        <ColumnReference Database="[sharedmsdb-LIVE]" Schema="[dbo]" Table="[smsFDGOrderStatus]" Alias="[s]" Column="StatusID" /> 
        <ColumnReference Database="[sharedmsdb-LIVE]" Schema="[dbo]" Table="[smsFDGOrderStatus]" Alias="[s]" Column="TimeAdded" /> 
        <ColumnReference Database="[sharedmsdb-LIVE]" Schema="[dbo]" Table="[smsFDGOrderStatus]" Alias="[s]" Column="cntID" /> 
        <ColumnReference Database="[sharedmsdb-LIVE]" Schema="[dbo]" Table="[smsFDGOrderStatus]" Alias="[s]" Column="empID" /> 
        <ColumnReference Database="[sharedmsdb-LIVE]" Schema="[dbo]" Table="[smsFDGOrderStatus]" Alias="[s]" Column="effectChildren" /> 
        <ColumnReference Database="[sharedmsdb-LIVE]" Schema="[dbo]" Table="[smsFDGOrderStatus]" Column="FDGOrder" /> 
        </OutputList> 
        <Merge ManyToMany="false"> 
        <InnerSideJoinColumns> 
         <ColumnReference Database="[sharedmsdb-LIVE]" Schema="[dbo]" Table="[smsFDGOrderStatus]" Alias="[s]" Column="FDGOrder" /> 
        </InnerSideJoinColumns> 
        <OuterSideJoinColumns> 
         <ColumnReference Database="[sharedmsdb-LIVE]" Schema="[dbo]" Table="[smsFDGOrderStatus]" Column="FDGOrder" /> 
        </OuterSideJoinColumns> 
        <Residual> 
         <ScalarOperator ScalarString="[sharedmsdb-LIVE].[dbo].[smsFDGOrderStatus].[FDGOrder]=[sharedmsdb-LIVE].[dbo].[smsFDGOrderStatus].[FDGOrder] as [s].[FDGOrder] AND [Expr1007]=[sharedmsdb-LIVE].[dbo].[smsFDGOrderStatus].[TimeAdded] as [s].[TimeAdded]"> 
         <Logical Operation="AND"> 
          <ScalarOperator> 
          <Compare CompareOp="EQ"> 
           <ScalarOperator> 
           <Identifier> 
            <ColumnReference Database="[sharedmsdb-LIVE]" Schema="[dbo]" Table="[smsFDGOrderStatus]" Column="FDGOrder" /> 
           </Identifier> 
           </ScalarOperator> 
           <ScalarOperator> 
           <Identifier> 
            <ColumnReference Database="[sharedmsdb-LIVE]" Schema="[dbo]" Table="[smsFDGOrderStatus]" Alias="[s]" Column="FDGOrder" /> 
           </Identifier> 
           </ScalarOperator> 
          </Compare> 
          </ScalarOperator> 
          <ScalarOperator> 
          <Compare CompareOp="EQ"> 
           <ScalarOperator> 
           <Identifier> 
            <ColumnReference Column="Expr1007" /> 
           </Identifier> 
           </ScalarOperator> 
           <ScalarOperator> 
           <Identifier> 
            <ColumnReference Database="[sharedmsdb-LIVE]" Schema="[dbo]" Table="[smsFDGOrderStatus]" Alias="[s]" Column="TimeAdded" /> 
           </Identifier> 
           </ScalarOperator> 
          </Compare> 
          </ScalarOperator> 
         </Logical> 
         </ScalarOperator> 
        </Residual> 
        <RelOp AvgRowSize="19" EstimateCPU="0.445733" EstimateIO="0" EstimateRebinds="0" EstimateRewinds="0" EstimatedExecutionMode="Row" EstimateRows="72440" LogicalOp="Aggregate" NodeId="3" Parallel="false" PhysicalOp="Stream Aggregate" EstimatedTotalSubtreeCost="2.57312"> 
         <OutputList> 
         <ColumnReference Database="[sharedmsdb-LIVE]" Schema="[dbo]" Table="[smsFDGOrderStatus]" Column="FDGOrder" /> 
         <ColumnReference Column="Expr1007" /> 
         </OutputList> 
         <StreamAggregate> 
         <DefinedValues> 
          <DefinedValue> 
          <ColumnReference Column="Expr1007" /> 
          <ScalarOperator ScalarString="MAX([sharedmsdb-LIVE].[dbo].[smsFDGOrderStatus].[TimeAdded])"> 
           <Aggregate AggType="MAX" Distinct="false"> 
           <ScalarOperator> 
            <Identifier> 
            <ColumnReference Database="[sharedmsdb-LIVE]" Schema="[dbo]" Table="[smsFDGOrderStatus]" Column="TimeAdded" /> 
            </Identifier> 
           </ScalarOperator> 
           </Aggregate> 
          </ScalarOperator> 
          </DefinedValue> 
         </DefinedValues> 
         <GroupBy> 
          <ColumnReference Database="[sharedmsdb-LIVE]" Schema="[dbo]" Table="[smsFDGOrderStatus]" Column="FDGOrder" /> 
         </GroupBy> 
         <RelOp AvgRowSize="19" EstimateCPU="0.750931" EstimateIO="1.37646" EstimateRebinds="0" EstimateRewinds="0" EstimatedExecutionMode="Row" EstimateRows="682522" LogicalOp="Index Scan" NodeId="4" Parallel="false" PhysicalOp="Index Scan" EstimatedTotalSubtreeCost="2.12739" TableCardinality="682522"> 
          <OutputList> 
          <ColumnReference Database="[sharedmsdb-LIVE]" Schema="[dbo]" Table="[smsFDGOrderStatus]" Column="FDGOrder" /> 
          <ColumnReference Database="[sharedmsdb-LIVE]" Schema="[dbo]" Table="[smsFDGOrderStatus]" Column="TimeAdded" /> 
          </OutputList> 
          <IndexScan Ordered="true" ScanDirection="FORWARD" ForcedIndex="false" ForceSeek="false" ForceScan="false" NoExpandHint="false" Storage="RowStore"> 
          <DefinedValues> 
           <DefinedValue> 
           <ColumnReference Database="[sharedmsdb-LIVE]" Schema="[dbo]" Table="[smsFDGOrderStatus]" Column="FDGOrder" /> 
           </DefinedValue> 
           <DefinedValue> 
           <ColumnReference Database="[sharedmsdb-LIVE]" Schema="[dbo]" Table="[smsFDGOrderStatus]" Column="TimeAdded" /> 
           </DefinedValue> 
          </DefinedValues> 
          <Object Database="[sharedmsdb-LIVE]" Schema="[dbo]" Table="[smsFDGOrderStatus]" Index="[ixd]" IndexKind="NonClustered" /> 
          </IndexScan> 
         </RelOp> 
         </StreamAggregate> 
        </RelOp> 
        <RelOp AvgRowSize="32" EstimateCPU="0.750931" EstimateIO="4.9935" EstimateRebinds="0" EstimateRewinds="0" EstimatedExecutionMode="Row" EstimateRows="682522" LogicalOp="Index Scan" NodeId="8" Parallel="false" PhysicalOp="Index Scan" EstimatedTotalSubtreeCost="5.74443" TableCardinality="682522"> 
         <OutputList> 
         <ColumnReference Database="[sharedmsdb-LIVE]" Schema="[dbo]" Table="[smsFDGOrderStatus]" Alias="[s]" Column="FDGOrder" /> 
         <ColumnReference Database="[sharedmsdb-LIVE]" Schema="[dbo]" Table="[smsFDGOrderStatus]" Alias="[s]" Column="StatusID" /> 
         <ColumnReference Database="[sharedmsdb-LIVE]" Schema="[dbo]" Table="[smsFDGOrderStatus]" Alias="[s]" Column="TimeAdded" /> 
         <ColumnReference Database="[sharedmsdb-LIVE]" Schema="[dbo]" Table="[smsFDGOrderStatus]" Alias="[s]" Column="cntID" /> 
         <ColumnReference Database="[sharedmsdb-LIVE]" Schema="[dbo]" Table="[smsFDGOrderStatus]" Alias="[s]" Column="empID" /> 
         <ColumnReference Database="[sharedmsdb-LIVE]" Schema="[dbo]" Table="[smsFDGOrderStatus]" Alias="[s]" Column="effectChildren" /> 
         </OutputList> 
         <IndexScan Ordered="true" ScanDirection="FORWARD" ForcedIndex="false" ForceSeek="false" ForceScan="false" NoExpandHint="false" Storage="RowStore"> 
         <DefinedValues> 
          <DefinedValue> 
          <ColumnReference Database="[sharedmsdb-LIVE]" Schema="[dbo]" Table="[smsFDGOrderStatus]" Alias="[s]" Column="FDGOrder" /> 
          </DefinedValue> 
          <DefinedValue> 
          <ColumnReference Database="[sharedmsdb-LIVE]" Schema="[dbo]" Table="[smsFDGOrderStatus]" Alias="[s]" Column="StatusID" /> 
          </DefinedValue> 
          <DefinedValue> 
          <ColumnReference Database="[sharedmsdb-LIVE]" Schema="[dbo]" Table="[smsFDGOrderStatus]" Alias="[s]" Column="TimeAdded" /> 
          </DefinedValue> 
          <DefinedValue> 
          <ColumnReference Database="[sharedmsdb-LIVE]" Schema="[dbo]" Table="[smsFDGOrderStatus]" Alias="[s]" Column="cntID" /> 
          </DefinedValue> 
          <DefinedValue> 
          <ColumnReference Database="[sharedmsdb-LIVE]" Schema="[dbo]" Table="[smsFDGOrderStatus]" Alias="[s]" Column="empID" /> 
          </DefinedValue> 
          <DefinedValue> 
          <ColumnReference Database="[sharedmsdb-LIVE]" Schema="[dbo]" Table="[smsFDGOrderStatus]" Alias="[s]" Column="effectChildren" /> 
          </DefinedValue> 
         </DefinedValues> 
         <Object Database="[sharedmsdb-LIVE]" Schema="[dbo]" Table="[smsFDGOrderStatus]" Index="[_dta_index_smsFDGOrderStatus_5_1938105945__K2_K3_K1_K4_5_6_7_8]" Alias="[s]" IndexKind="NonClustered" /> 
         </IndexScan> 
        </RelOp> 
        </Merge> 
       </RelOp> 
       </Merge> 
      </RelOp> 
      </QueryPlan> 
     </StmtSimple> 
     </Statements> 
    </Batch> 
    </BatchSequence> 
</ShowPlanXML>

источник

2016-03-03 Sourav Mukherjee

FYI: Я работаю с огромные данные. поэтому нужно оптимизировать. –

Что вы подразумеваете под ** Я не могу создать кластеризованный индекс в моем представлении **? Отправьте сообщение об ошибке. Также использование 'MAX()' недопустимо в Indexed Views – Raj

Вы используете 'MAX' и подзапрос, которые не поддерживаются в представлениях индексов – Devart

Вариант № 1:

CREATE /*UNIQUE*/ NONCLUSTERED INDEX ix ON dbo.smsFDGOrderStatus (FDGOrder, TimeAdded DESC) 
GO 

SELECT t.id, 
     t.Customer, 
     t.Scanner, 
     t.custType, 
     s.FDGOrder, 
     s.StatusID, 
     s.TimeAdded, 
     s.cntID, 
     s.empID, 
     s.effectChildren 
FROM dbo.smsFDGOrder t 
JOIN dbo.smsFDGOrderStatus s ON t.id = s.FDGOrder 
JOIN (
    SELECT FDGOrder, MAX(TimeAdded) AS MAX_TIME 
    FROM dbo.smsFDGOrderStatus 
    GROUP BY FDGOrder 
) a ON a.FDGOrder = s.FDGOrder 
    AND a.MAX_TIME = s.TimeAdded

Вариант № 2:

CREATE /*UNIQUE*/ NONCLUSTERED INDEX ix2 
    ON dbo.smsFDGOrderStatus(FDGOrder, TimeAdded DESC) 
    INCLUDE (StatusID, cntID, empID, effectChildren) 
GO 

SELECT t.id, 
     t.Customer, 
     t.Scanner, 
     t.custType, 
     s.FDGOrder, 
     s.StatusID, 
     s.TimeAdded, 
     s.cntID, 
     s.empID, 
     s.effectChildren 
FROM dbo.smsFDGOrder t 
JOIN (
    SELECT FDGOrder, 
      StatusID, 
      TimeAdded, 
      cntID, 
      empID, 
      effectChildren, 
      RowNum = ROW_NUMBER() OVER (PARTITION BY FDGOrder ORDER BY TimeAdded DESC) 
    FROM dbo.smsFDGOrderStatus 
) t ON t.id = s.FDGOrder 
    AND t.RowNum = 1

Вариант № 3 ... длинный путь - агрегированные таблицы:

IF OBJECT_ID('dbo.smsFDGOrderStatus_Last', 'U') IS NOT NULL 
    DROP TABLE dbo.smsFDGOrderStatus_Last 
GO 

SELECT FDGOrder, MAX(TimeAdded) AS MAX_TIME 
INTO dbo.smsFDGOrderStatus_Last 
FROM dbo.smsFDGOrderStatus 
GROUP BY FDGOrder 
GO 

CREATE UNIQUE CLUSTERED INDEX ix_l ON dbo.table_name (FDGOrder) 
GO 

CREATE /*UNIQUE*/ NONCLUSTERED INDEX ix2 
    ON dbo.smsFDGOrderStatus(FDGOrder, TimeAdded DESC) 
    INCLUDE (StatusID, cntID, empID, effectChildren) 
GO 

CREATE TRIGGER dbo.trg_ID 
    ON dbo.smsFDGOrderStatus 
    AFTER INSERT 
AS 
BEGIN 
    SET NOCOUNT ON; 

    ;WITH cte AS (
     SELECT * 
     FROM dbo.smsFDGOrderStatus 
     WHERE FDGOrder IN (SELECT i.FDGOrder FROM INSERTED i)  
    ) 
    MERGE cte t 
    USING (
     SELECT FDGOrder, MAX(TimeAdded) AS MAX_TIME 
     FROM INSERTED 
     GROUP BY FDGOrder 
    ) s ON s.ManufacturerName = t.ManufacturerString 
    WHEN MATCHED AND (t.MAX_TIME != s.MAX_TIME) 
    THEN 
     UPDATE SET MAX_TIME = s.MAX_TIME 
    WHEN NOT MATCHED BY TARGET 
    THEN 
     INSERT (FDGOrder, MAX_TIME) 
     VALUES (s.ManufacturerName, s.MAX_TIME); 

END 
GO 

SELECT t.id, 
     t.Customer, 
     t.Scanner, 
     t.custType, 
     s.FDGOrder, 
     s.StatusID, 
     s.TimeAdded, 
     s.cntID, 
     s.empID, 
     s.effectChildren 
FROM dbo.smsFDGOrder t 
JOIN dbo.smsFDGOrderStatus s ON t.id = s.FDGOrder 
JOIN dbo.smsFDGOrderStatus_Last a ON a.FDGOrder = s.FDGOrder AND a.MAX_TIME = s.TimeAdded

источник

2016-03-03 11:36:39 Devart

Предоставить план выполнения этого запроса ... Заранее спасибо – Devart

Спасибо за вашу помощь. Пожалуйста, проверьте свой план выполнения, который я обновил в вопросе выше. У меня только одна вещь, которую я должен был изменить в вашем коде: a.FDGOrder = s.FDGOrder вместо a.FDGOrder = t.FDGOrder. –

Как насчет времени выполнения? по сравнению с начальным запросом ... – Devart

Невозможно создать индексированный вид в SQL Server

ответ

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