SQL Server 2022

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CREATE TABLE dbo.Messages (

    TenantId    int          NOT NULL,
    RecipientId int          NOT NULL,
    MessageId   int          NOT NULL IDENTITY,
    SentUtc     datetime2(7) NOT NULL,
    IsDeleted   bit          NOT NULL, /* Less than 5% of rows have IsDeleted = 1 */
    -- Body, Subject, etc
    
    CONSTRAINT PK_Messages PRIMARY KEY ( MessageId, TenantId ),

    CONSTRAINT UK_Messages UNIQUE ( MessageId ),

    --CONSTRAINT FK_Messages_Tenants FOREIGN KEY ( TenantId ) REFERENCES dbo.Tenants ( TenantId ),
    --CONSTRAINT FK_Messages_Recipients FOREIGN KEY ( RecipientId, TenantId ) REFERENCES dbo.Recipients ( RecipientId, TenantId )
);
CREATE VIEW dbo.LatestMessages
    WITH SCHEMABINDING
AS

WITH latestMessageUtcPerRecipient AS (

    SELECT
        m.TenantId,
        m.RecipientId,
        MAX( m.SentUtc ) AS MaxSentUtc
    FROM
        dbo.Messages AS m
    WHERE
        m.IsDeleted = 0
    GROUP BY
        m.TenantId,
        m.RecipientId
)
SELECT
    lm.TenantId,
    lm.RecipientId,
    m .MessageId,
    m .SentUtc

FROM
    dbo.Messages AS m

    INNER JOIN latestMessageUtcPerRecipient AS lm ON
        m.TenantId = lm.TenantId
        AND
        m.RecipientId = lm.RecipientId
        AND
        m.SentUtc = lm.MaxSentUtc
set statistics xml on;

select *
from LatestMessages;


TenantId
RecipientId
MessageId
SentUtc




Microsoft SQL Server 2005 XML Showplan


<ShowPlanXML xmlns="http://schemas.microsoft.com/sqlserver/2004/07/showplan" Version="1.564" Build="16.0.1000.6"><BatchSequence><Batch><Statements><StmtSimple StatementText="select *&#xa;from LatestMessages" StatementId="1" StatementCompId="2" StatementType="SELECT" StatementSqlHandle="0x0900242B025053A123443936CE24F6D6D1AE0000000000000000000000000000000000000000000000000000" DatabaseContextSettingsId="1" ParentObjectId="0" StatementParameterizationType="0" RetrievedFromCache="true" StatementSubTreeCost="0.0349026" StatementEstRows="1" SecurityPolicyApplied="false" StatementOptmLevel="FULL" QueryHash="0x7DEB573106F0EBF6" QueryPlanHash="0x35A528FE640B0762" StatementOptmEarlyAbortReason="GoodEnoughPlanFound" CardinalityEstimationModelVersion="160"><StatementSetOptions QUOTED_IDENTIFIER="true" ARITHABORT="true" CONCAT_NULL_YIELDS_NULL="true" ANSI_NULLS="true" ANSI_PADDING="true" ANSI_WARNINGS="true" NUMERIC_ROUNDABORT="false"></StatementSetOptions><QueryPlan DegreeOfParallelism="0" MemoryGrant="1024" NonParallelPlanReason="NoParallelPlansInDesktopOrExpressEdition" CachedPlanSize="40" CompileTime="15" CompileCPU="15" CompileMemory="296"><MemoryGrantInfo SerialRequiredMemory="640" SerialDesiredMemory="704" RequiredMemory="640" DesiredMemory="704" RequestedMemory="1024" GrantWaitTime="0" MaxQueryMemory="749200" GrantedMemory="1024" MaxUsedMemory="0"></MemoryGrantInfo><OptimizerHardwareDependentProperties EstimatedAvailableMemoryGrant="1258238" EstimatedPagesCached="78639" EstimatedAvailableDegreeOfParallelism="1" MaxCompileMemory="1247048"></OptimizerHardwareDependentProperties><TraceFlags IsCompileTime="1"><TraceFlag Value="460" Scope="Global"></TraceFlag><TraceFlag Value="8017" Scope="Global"></TraceFlag></TraceFlags><TraceFlags IsCompileTime="0"><TraceFlag Value="460" Scope="Global"></TraceFlag><TraceFlag Value="8017" Scope="Global"></TraceFlag></TraceFlags><QueryTimeStats ElapsedTime="0" CpuTime="0"></QueryTimeStats><RelOp NodeId="0" PhysicalOp="Merge Join" LogicalOp="Inner Join" EstimateRows="1" EstimateIO="0" EstimateCPU="0.0056022" AvgRowSize="27" EstimatedTotalSubtreeCost="0.0349026" Parallel="0" EstimateRebinds="0" EstimateRewinds="0" EstimatedExecutionMode="Row"><OutputList><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="MessageId"></ColumnReference><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="SentUtc"></ColumnReference><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="TenantId"></ColumnReference><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="RecipientId"></ColumnReference></OutputList><RunTimeInformation><RunTimeCountersPerThread Thread="0" ActualRows="0" Batches="0" ActualElapsedms="0" ActualCPUms="0" ActualScans="0" ActualLogicalReads="0" ActualPhysicalReads="0" ActualReadAheads="0" ActualLobLogicalReads="0" ActualLobPhysicalReads="0" ActualLobReadAheads="0" ActualEndOfScans="1" ActualExecutions="1" ActualExecutionMode="Row"></RunTimeCountersPerThread></RunTimeInformation><Merge ManyToMany="0"><InnerSideJoinColumns><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="TenantId"></ColumnReference><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="RecipientId"></ColumnReference><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="SentUtc"></ColumnReference></InnerSideJoinColumns><OuterSideJoinColumns><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="TenantId"></ColumnReference><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="RecipientId"></ColumnReference><ColumnReference Column="Expr1002"></ColumnReference></OuterSideJoinColumns><Residual><ScalarOperator ScalarString="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457].[dbo].[Messages].[TenantId] as [m].[TenantId]=[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457].[dbo].[Messages].[TenantId] as [m].[TenantId] AND [fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457].[dbo].[Messages].[RecipientId] as [m].[RecipientId]=[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457].[dbo].[Messages].[RecipientId] as [m].[RecipientId] AND [fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457].[dbo].[Messages].[SentUtc] as [m].[SentUtc]=[Expr1002]"><Logical Operation="AND"><ScalarOperator><Compare CompareOp="EQ"><ScalarOperator><Identifier><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="TenantId"></ColumnReference></Identifier></ScalarOperator><ScalarOperator><Identifier><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="TenantId"></ColumnReference></Identifier></ScalarOperator></Compare></ScalarOperator><ScalarOperator><Compare CompareOp="EQ"><ScalarOperator><Identifier><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="RecipientId"></ColumnReference></Identifier></ScalarOperator><ScalarOperator><Identifier><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="RecipientId"></ColumnReference></Identifier></ScalarOperator></Compare></ScalarOperator><ScalarOperator><Compare CompareOp="EQ"><ScalarOperator><Identifier><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="SentUtc"></ColumnReference></Identifier></ScalarOperator><ScalarOperator><Identifier><ColumnReference Column="Expr1002"></ColumnReference></Identifier></ScalarOperator></Compare></ScalarOperator></Logical></ScalarOperator></Residual><RelOp NodeId="1" PhysicalOp="Stream Aggregate" LogicalOp="Aggregate" EstimateRows="1" EstimateIO="0" EstimateCPU="1.1e-06" AvgRowSize="23" EstimatedTotalSubtreeCost="0.014646" Parallel="0" EstimateRebinds="0" EstimateRewinds="0" EstimatedExecutionMode="Row"><OutputList><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="TenantId"></ColumnReference><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="RecipientId"></ColumnReference><ColumnReference Column="Expr1002"></ColumnReference></OutputList><RunTimeInformation><RunTimeCountersPerThread Thread="0" ActualRows="0" Batches="0" ActualElapsedms="0" ActualCPUms="0" ActualEndOfScans="1" ActualExecutions="1" ActualExecutionMode="Row"></RunTimeCountersPerThread></RunTimeInformation><StreamAggregate><DefinedValues><DefinedValue><ColumnReference Column="Expr1002"></ColumnReference><ScalarOperator ScalarString="MAX([fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457].[dbo].[Messages].[SentUtc] as [m].[SentUtc])"><Aggregate Distinct="0" AggType="MAX"><ScalarOperator><Identifier><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="SentUtc"></ColumnReference></Identifier></ScalarOperator></Aggregate></ScalarOperator></DefinedValue></DefinedValues><GroupBy><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="TenantId"></ColumnReference><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="RecipientId"></ColumnReference></GroupBy><RelOp NodeId="2" PhysicalOp="Sort" LogicalOp="Sort" EstimateRows="1" EstimateIO="0.0112613" EstimateCPU="0.000100023" AvgRowSize="23" EstimatedTotalSubtreeCost="0.0146449" Parallel="0" EstimateRebinds="0" EstimateRewinds="0" EstimatedExecutionMode="Row"><OutputList><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="TenantId"></ColumnReference><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="RecipientId"></ColumnReference><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="SentUtc"></ColumnReference></OutputList><MemoryFractions Input="1" Output="0.5"></MemoryFractions><RunTimeInformation><RunTimeCountersPerThread Thread="0" ActualRows="0" Batches="0" ActualElapsedms="0" ActualCPUms="0" ActualScans="0" ActualLogicalReads="0" ActualPhysicalReads="0" ActualReadAheads="0" ActualLobLogicalReads="0" ActualLobPhysicalReads="0" ActualLobReadAheads="0" ActualRebinds="1" ActualRewinds="0" ActualEndOfScans="1" ActualExecutions="1" InputMemoryGrant="896" OutputMemoryGrant="320" UsedMemoryGrant="0" ActualExecutionMode="Row"></RunTimeCountersPerThread></RunTimeInformation><Sort Distinct="0"><OrderBy><OrderByColumn Ascending="1"><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="TenantId"></ColumnReference></OrderByColumn><OrderByColumn Ascending="1"><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="RecipientId"></ColumnReference></OrderByColumn></OrderBy><RelOp NodeId="3" PhysicalOp="Clustered Index Scan" LogicalOp="Clustered Index Scan" EstimateRows="1" EstimatedRowsRead="1" EstimateIO="0.003125" EstimateCPU="0.0001581" AvgRowSize="24" EstimatedTotalSubtreeCost="0.0032831" TableCardinality="0" Parallel="0" EstimateRebinds="0" EstimateRewinds="0" EstimatedExecutionMode="Row"><OutputList><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="TenantId"></ColumnReference><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="RecipientId"></ColumnReference><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="SentUtc"></ColumnReference></OutputList><RunTimeInformation><RunTimeCountersPerThread Thread="0" ActualRows="0" Batches="0" ActualElapsedms="0" ActualCPUms="0" ActualScans="1" ActualLogicalReads="0" ActualPhysicalReads="0" ActualReadAheads="0" ActualLobLogicalReads="0" ActualLobPhysicalReads="0" ActualLobReadAheads="0" ActualEndOfScans="1" ActualExecutions="1" ActualExecutionMode="Row"></RunTimeCountersPerThread></RunTimeInformation><IndexScan Ordered="0" ForcedIndex="0" ForceScan="0" NoExpandHint="0" Storage="RowStore"><DefinedValues><DefinedValue><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="TenantId"></ColumnReference></DefinedValue><DefinedValue><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="RecipientId"></ColumnReference></DefinedValue><DefinedValue><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="SentUtc"></ColumnReference></DefinedValue></DefinedValues><Object Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Index="[PK_Messages]" Alias="[m]" TableReferenceId="2" IndexKind="Clustered" Storage="RowStore"></Object><Predicate><ScalarOperator ScalarString="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457].[dbo].[Messages].[IsDeleted] as [m].[IsDeleted]=(0)"><Compare CompareOp="EQ"><ScalarOperator><Identifier><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="IsDeleted"></ColumnReference></Identifier></ScalarOperator><ScalarOperator><Const ConstValue="(0)"></Const></ScalarOperator></Compare></ScalarOperator></Predicate></IndexScan></RelOp></Sort></RelOp></StreamAggregate></RelOp><RelOp NodeId="4" PhysicalOp="Sort" LogicalOp="Sort" EstimateRows="1" EstimateIO="0.0112613" EstimateCPU="0.000100027" AvgRowSize="27" EstimatedTotalSubtreeCost="0.0146444" Parallel="0" EstimateRebinds="0" EstimateRewinds="0" EstimatedExecutionMode="Row"><OutputList><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="TenantId"></ColumnReference><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="RecipientId"></ColumnReference><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="MessageId"></ColumnReference><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="SentUtc"></ColumnReference></OutputList><MemoryFractions Input="0.5" Output="0.5"></MemoryFractions><RunTimeInformation><RunTimeCountersPerThread Thread="0" ActualRows="0" Batches="0" ActualElapsedms="0" ActualCPUms="0" ActualScans="0" ActualLogicalReads="0" ActualPhysicalReads="0" ActualReadAheads="0" ActualLobLogicalReads="0" ActualLobPhysicalReads="0" ActualLobReadAheads="0" ActualRebinds="1" ActualRewinds="0" ActualEndOfScans="1" ActualExecutions="1" InputMemoryGrant="704" OutputMemoryGrant="320" UsedMemoryGrant="0" ActualExecutionMode="Row"></RunTimeCountersPerThread></RunTimeInformation><Sort Distinct="0"><OrderBy><OrderByColumn Ascending="1"><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="TenantId"></ColumnReference></OrderByColumn><OrderByColumn Ascending="1"><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="RecipientId"></ColumnReference></OrderByColumn><OrderByColumn Ascending="1"><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="SentUtc"></ColumnReference></OrderByColumn></OrderBy><RelOp NodeId="5" PhysicalOp="Clustered Index Scan" LogicalOp="Clustered Index Scan" EstimateRows="1" EstimatedRowsRead="1" EstimateIO="0.003125" EstimateCPU="0.0001581" AvgRowSize="27" EstimatedTotalSubtreeCost="0.0032831" TableCardinality="0" Parallel="0" EstimateRebinds="0" EstimateRewinds="0" EstimatedExecutionMode="Row"><OutputList><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="TenantId"></ColumnReference><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="RecipientId"></ColumnReference><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="MessageId"></ColumnReference><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="SentUtc"></ColumnReference></OutputList><RunTimeInformation><RunTimeCountersPerThread Thread="0" ActualRows="0" Batches="0" ActualElapsedms="0" ActualCPUms="0" ActualScans="1" ActualLogicalReads="0" ActualPhysicalReads="0" ActualReadAheads="0" ActualLobLogicalReads="0" ActualLobPhysicalReads="0" ActualLobReadAheads="0" ActualEndOfScans="1" ActualExecutions="1" ActualExecutionMode="Row"></RunTimeCountersPerThread></RunTimeInformation><IndexScan Ordered="0" ForcedIndex="0" ForceScan="0" NoExpandHint="0" Storage="RowStore"><DefinedValues><DefinedValue><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="TenantId"></ColumnReference></DefinedValue><DefinedValue><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="RecipientId"></ColumnReference></DefinedValue><DefinedValue><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="MessageId"></ColumnReference></DefinedValue><DefinedValue><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="SentUtc"></ColumnReference></DefinedValue></DefinedValues><Object Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Index="[PK_Messages]" Alias="[m]" TableReferenceId="1" IndexKind="Clustered" Storage="RowStore"></Object></IndexScan></RelOp></Sort></RelOp></Merge></RelOp></QueryPlan></StmtSimple></Statements></Batch></BatchSequence></ShowPlanXML>


CREATE INDEX IX ON Messages 
  (TenantID, RecipientId, SentUtc DESC)
  INCLUDE (IsDeleted, MessageId)
;
set statistics xml on;

select *
from LatestMessages;


TenantId
RecipientId
MessageId
SentUtc




Microsoft SQL Server 2005 XML Showplan


<ShowPlanXML xmlns="http://schemas.microsoft.com/sqlserver/2004/07/showplan" Version="1.564" Build="16.0.1000.6"><BatchSequence><Batch><Statements><StmtSimple StatementText="select *&#xa;from LatestMessages" StatementId="1" StatementCompId="2" StatementType="SELECT" StatementSqlHandle="0x0900242B025053A123443936CE24F6D6D1AE0000000000000000000000000000000000000000000000000000" DatabaseContextSettingsId="1" ParentObjectId="0" StatementParameterizationType="0" RetrievedFromCache="true" StatementSubTreeCost="0.00657196" StatementEstRows="1" SecurityPolicyApplied="false" StatementOptmLevel="FULL" QueryHash="0x7DEB573106F0EBF6" QueryPlanHash="0x684A7C3AF6904964" StatementOptmEarlyAbortReason="GoodEnoughPlanFound" CardinalityEstimationModelVersion="160"><StatementSetOptions QUOTED_IDENTIFIER="true" ARITHABORT="true" CONCAT_NULL_YIELDS_NULL="true" ANSI_NULLS="true" ANSI_PADDING="true" ANSI_WARNINGS="true" NUMERIC_ROUNDABORT="false"></StatementSetOptions><QueryPlan DegreeOfParallelism="0" NonParallelPlanReason="NoParallelPlansInDesktopOrExpressEdition" CachedPlanSize="32" CompileTime="0" CompileCPU="0" CompileMemory="288"><MemoryGrantInfo SerialRequiredMemory="0" SerialDesiredMemory="0" GrantedMemory="0" MaxUsedMemory="0"></MemoryGrantInfo><OptimizerHardwareDependentProperties EstimatedAvailableMemoryGrant="1258238" EstimatedPagesCached="78639" EstimatedAvailableDegreeOfParallelism="1" MaxCompileMemory="1247048"></OptimizerHardwareDependentProperties><TraceFlags IsCompileTime="1"><TraceFlag Value="460" Scope="Global"></TraceFlag><TraceFlag Value="8017" Scope="Global"></TraceFlag></TraceFlags><TraceFlags IsCompileTime="0"><TraceFlag Value="460" Scope="Global"></TraceFlag><TraceFlag Value="8017" Scope="Global"></TraceFlag></TraceFlags><QueryTimeStats ElapsedTime="0" CpuTime="0"></QueryTimeStats><RelOp NodeId="0" PhysicalOp="Nested Loops" LogicalOp="Inner Join" EstimateRows="1" EstimateIO="0" EstimateCPU="4.18e-06" AvgRowSize="27" EstimatedTotalSubtreeCost="0.00657196" Parallel="0" EstimateRebinds="0" EstimateRewinds="0" EstimatedExecutionMode="Row"><OutputList><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="MessageId"></ColumnReference><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="SentUtc"></ColumnReference><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="TenantId"></ColumnReference><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="RecipientId"></ColumnReference></OutputList><RunTimeInformation><RunTimeCountersPerThread Thread="0" ActualRows="0" Batches="0" ActualElapsedms="0" ActualCPUms="0" ActualEndOfScans="1" ActualExecutions="1" ActualExecutionMode="Row"></RunTimeCountersPerThread></RunTimeInformation><NestedLoops Optimized="0"><OuterReferences><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="TenantId"></ColumnReference><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="RecipientId"></ColumnReference><ColumnReference Column="Expr1002"></ColumnReference></OuterReferences><RelOp NodeId="1" PhysicalOp="Stream Aggregate" LogicalOp="Aggregate" EstimateRows="1" EstimateIO="0" EstimateCPU="1.1e-06" AvgRowSize="23" EstimatedTotalSubtreeCost="0.00328468" Parallel="0" EstimateRebinds="0" EstimateRewinds="0" EstimatedExecutionMode="Row"><OutputList><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="TenantId"></ColumnReference><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="RecipientId"></ColumnReference><ColumnReference Column="Expr1002"></ColumnReference></OutputList><RunTimeInformation><RunTimeCountersPerThread Thread="0" ActualRows="0" Batches="0" ActualElapsedms="0" ActualCPUms="0" ActualEndOfScans="1" ActualExecutions="1" ActualExecutionMode="Row"></RunTimeCountersPerThread></RunTimeInformation><StreamAggregate><DefinedValues><DefinedValue><ColumnReference Column="Expr1002"></ColumnReference><ScalarOperator ScalarString="MAX([fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457].[dbo].[Messages].[SentUtc] as [m].[SentUtc])"><Aggregate Distinct="0" AggType="MAX"><ScalarOperator><Identifier><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="SentUtc"></ColumnReference></Identifier></ScalarOperator></Aggregate></ScalarOperator></DefinedValue></DefinedValues><GroupBy><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="TenantId"></ColumnReference><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="RecipientId"></ColumnReference></GroupBy><RelOp NodeId="2" PhysicalOp="Index Scan" LogicalOp="Index Scan" EstimateRows="1" EstimatedRowsRead="1" EstimateIO="0.003125" EstimateCPU="0.0001581" AvgRowSize="24" EstimatedTotalSubtreeCost="0.0032831" TableCardinality="0" Parallel="0" EstimateRebinds="0" EstimateRewinds="0" EstimatedExecutionMode="Row"><OutputList><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="TenantId"></ColumnReference><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="RecipientId"></ColumnReference><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="SentUtc"></ColumnReference></OutputList><RunTimeInformation><RunTimeCountersPerThread Thread="0" ActualRows="0" Batches="0" ActualElapsedms="0" ActualCPUms="0" ActualScans="1" ActualLogicalReads="0" ActualPhysicalReads="0" ActualReadAheads="0" ActualLobLogicalReads="0" ActualLobPhysicalReads="0" ActualLobReadAheads="0" ActualEndOfScans="1" ActualExecutions="1" ActualExecutionMode="Row"></RunTimeCountersPerThread></RunTimeInformation><IndexScan Ordered="1" ScanDirection="FORWARD" ForcedIndex="0" ForceSeek="0" ForceScan="0" NoExpandHint="0" Storage="RowStore"><DefinedValues><DefinedValue><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="TenantId"></ColumnReference></DefinedValue><DefinedValue><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="RecipientId"></ColumnReference></DefinedValue><DefinedValue><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="SentUtc"></ColumnReference></DefinedValue></DefinedValues><Object Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Index="[IX]" Alias="[m]" TableReferenceId="2" IndexKind="NonClustered" Storage="RowStore"></Object><Predicate><ScalarOperator ScalarString="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457].[dbo].[Messages].[IsDeleted] as [m].[IsDeleted]=(0)"><Compare CompareOp="EQ"><ScalarOperator><Identifier><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="IsDeleted"></ColumnReference></Identifier></ScalarOperator><ScalarOperator><Const ConstValue="(0)"></Const></ScalarOperator></Compare></ScalarOperator></Predicate></IndexScan></RelOp></StreamAggregate></RelOp><RelOp NodeId="3" PhysicalOp="Index Seek" LogicalOp="Index Seek" EstimateRows="1" EstimatedRowsRead="1" EstimateIO="0.003125" EstimateCPU="0.0001581" AvgRowSize="19" EstimatedTotalSubtreeCost="0.0032831" TableCardinality="0" Parallel="0" EstimateRebinds="0" EstimateRewinds="0" EstimatedExecutionMode="Row"><OutputList><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="MessageId"></ColumnReference><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="SentUtc"></ColumnReference></OutputList><RunTimeInformation><RunTimeCountersPerThread Thread="0" ActualRows="0" Batches="0" ActualElapsedms="0" ActualCPUms="0" ActualScans="0" ActualLogicalReads="0" ActualPhysicalReads="0" ActualReadAheads="0" ActualLobLogicalReads="0" ActualLobPhysicalReads="0" ActualLobReadAheads="0" ActualEndOfScans="0" ActualExecutions="0" ActualExecutionMode="Row"></RunTimeCountersPerThread></RunTimeInformation><IndexScan Ordered="1" ScanDirection="FORWARD" ForcedIndex="0" ForceSeek="0" ForceScan="0" NoExpandHint="0" Storage="RowStore"><DefinedValues><DefinedValue><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="MessageId"></ColumnReference></DefinedValue><DefinedValue><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="SentUtc"></ColumnReference></DefinedValue></DefinedValues><Object Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Index="[IX]" Alias="[m]" TableReferenceId="1" IndexKind="NonClustered" Storage="RowStore"></Object><SeekPredicates><SeekPredicateNew><SeekKeys><Prefix ScanType="EQ"><RangeColumns><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="TenantId"></ColumnReference><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="RecipientId"></ColumnReference><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="SentUtc"></ColumnReference></RangeColumns><RangeExpressions><ScalarOperator ScalarString="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457].[dbo].[Messages].[TenantId] as [m].[TenantId]"><Identifier><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="TenantId"></ColumnReference></Identifier></ScalarOperator><ScalarOperator ScalarString="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457].[dbo].[Messages].[RecipientId] as [m].[RecipientId]"><Identifier><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="RecipientId"></ColumnReference></Identifier></ScalarOperator><ScalarOperator ScalarString="[Expr1002]"><Identifier><ColumnReference Column="Expr1002"></ColumnReference></Identifier></ScalarOperator></RangeExpressions></Prefix></SeekKeys></SeekPredicateNew></SeekPredicates></IndexScan></RelOp></NestedLoops></RelOp></QueryPlan></StmtSimple></Statements></Batch></BatchSequence></ShowPlanXML>


CREATE OR ALTER VIEW dbo.LatestMessages
    WITH SCHEMABINDING
AS

WITH latestMessageUtcPerRecipient AS (

    SELECT
        m.TenantId,
        m.RecipientId,
        m.MessageId,
        m.SentUtc,
        DENSE_RANK() OVER (PARTITION BY m.TenantID, m.RecipientId ORDER BY m.SentUtc DESC) AS dr
    FROM
        dbo.Messages AS m
    WHERE
        m.IsDeleted = 0
)
SELECT
    m.TenantId,
    m.RecipientId,
    m .MessageId,
    m .SentUtc
FROM
    latestMessageUtcPerRecipient AS m
WHERE m.dr = 1;
set statistics xml on;

select *
from LatestMessages;


TenantId
RecipientId
MessageId
SentUtc




Microsoft SQL Server 2005 XML Showplan


<ShowPlanXML xmlns="http://schemas.microsoft.com/sqlserver/2004/07/showplan" Version="1.564" Build="16.0.1000.6"><BatchSequence><Batch><Statements><StmtSimple StatementText="select *&#xa;from LatestMessages" StatementId="1" StatementCompId="2" StatementType="SELECT" StatementSqlHandle="0x0900242B025053A123443936CE24F6D6D1AE0000000000000000000000000000000000000000000000000000" DatabaseContextSettingsId="1" ParentObjectId="0" StatementParameterizationType="0" RetrievedFromCache="true" StatementSubTreeCost="0.00328416" StatementEstRows="1" SecurityPolicyApplied="false" StatementOptmLevel="FULL" QueryHash="0x6EB8195466406BB1" QueryPlanHash="0x54D9D22C8619B466" StatementOptmEarlyAbortReason="GoodEnoughPlanFound" CardinalityEstimationModelVersion="160"><StatementSetOptions QUOTED_IDENTIFIER="true" ARITHABORT="true" CONCAT_NULL_YIELDS_NULL="true" ANSI_NULLS="true" ANSI_PADDING="true" ANSI_WARNINGS="true" NUMERIC_ROUNDABORT="false"></StatementSetOptions><QueryPlan DegreeOfParallelism="0" NonParallelPlanReason="NoParallelPlansInDesktopOrExpressEdition" CachedPlanSize="32" CompileTime="0" CompileCPU="0" CompileMemory="192"><MemoryGrantInfo SerialRequiredMemory="0" SerialDesiredMemory="0" GrantedMemory="0" MaxUsedMemory="0"></MemoryGrantInfo><OptimizerHardwareDependentProperties EstimatedAvailableMemoryGrant="1258238" EstimatedPagesCached="78639" EstimatedAvailableDegreeOfParallelism="1" MaxCompileMemory="1247048"></OptimizerHardwareDependentProperties><TraceFlags IsCompileTime="1"><TraceFlag Value="460" Scope="Global"></TraceFlag><TraceFlag Value="8017" Scope="Global"></TraceFlag></TraceFlags><TraceFlags IsCompileTime="0"><TraceFlag Value="460" Scope="Global"></TraceFlag><TraceFlag Value="8017" Scope="Global"></TraceFlag></TraceFlags><QueryTimeStats ElapsedTime="0" CpuTime="0"></QueryTimeStats><RelOp NodeId="0" PhysicalOp="Filter" LogicalOp="Filter" EstimateRows="1" EstimateIO="0" EstimateCPU="4.8e-07" AvgRowSize="27" EstimatedTotalSubtreeCost="0.00328416" Parallel="0" EstimateRebinds="0" EstimateRewinds="0" EstimatedExecutionMode="Row"><OutputList><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="TenantId"></ColumnReference><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="RecipientId"></ColumnReference><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="MessageId"></ColumnReference><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="SentUtc"></ColumnReference></OutputList><RunTimeInformation><RunTimeCountersPerThread Thread="0" ActualRows="0" Batches="0" ActualElapsedms="0" ActualCPUms="0" ActualEndOfScans="1" ActualExecutions="1" ActualExecutionMode="Row"></RunTimeCountersPerThread></RunTimeInformation><Filter StartupExpression="0"><RelOp NodeId="1" PhysicalOp="Sequence Project" LogicalOp="Compute Scalar" EstimateRows="1" EstimateIO="0" EstimateCPU="6e-08" AvgRowSize="35" EstimatedTotalSubtreeCost="0.00328368" Parallel="0" EstimateRebinds="0" EstimateRewinds="0" EstimatedExecutionMode="Row"><OutputList><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="TenantId"></ColumnReference><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="RecipientId"></ColumnReference><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="MessageId"></ColumnReference><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="SentUtc"></ColumnReference><ColumnReference Column="Expr1001"></ColumnReference></OutputList><RunTimeInformation><RunTimeCountersPerThread Thread="0" ActualRows="0" Batches="0" ActualElapsedms="0" ActualCPUms="0" ActualEndOfScans="1" ActualExecutions="1" ActualExecutionMode="Row"></RunTimeCountersPerThread></RunTimeInformation><SequenceProject><DefinedValues><DefinedValue><ColumnReference Column="Expr1001"></ColumnReference><ScalarOperator ScalarString="dense_rank"><Sequence FunctionName="dense_rank"></Sequence></ScalarOperator></DefinedValue></DefinedValues><RelOp NodeId="2" PhysicalOp="Segment" LogicalOp="Segment" EstimateRows="1" EstimateIO="0" EstimateCPU="2e-08" AvgRowSize="35" EstimatedTotalSubtreeCost="0.00328333" Parallel="0" EstimateRebinds="0" EstimateRewinds="0" EstimatedExecutionMode="Row"><OutputList><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="TenantId"></ColumnReference><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="RecipientId"></ColumnReference><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="MessageId"></ColumnReference><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="SentUtc"></ColumnReference><ColumnReference Column="Segment1002"></ColumnReference><ColumnReference Column="Segment1003"></ColumnReference></OutputList><RunTimeInformation><RunTimeCountersPerThread Thread="0" ActualRows="0" Batches="0" ActualElapsedms="0" ActualCPUms="0" ActualEndOfScans="1" ActualExecutions="1" ActualExecutionMode="Row"></RunTimeCountersPerThread></RunTimeInformation><Segment><GroupBy><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="TenantId"></ColumnReference><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="RecipientId"></ColumnReference><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="SentUtc"></ColumnReference></GroupBy><SegmentColumn><ColumnReference Column="Segment1003"></ColumnReference></SegmentColumn><RelOp NodeId="3" PhysicalOp="Segment" LogicalOp="Segment" EstimateRows="1" EstimateIO="0" EstimateCPU="2e-08" AvgRowSize="35" EstimatedTotalSubtreeCost="0.00328322" Parallel="0" EstimateRebinds="0" EstimateRewinds="0" EstimatedExecutionMode="Row"><OutputList><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="TenantId"></ColumnReference><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="RecipientId"></ColumnReference><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="MessageId"></ColumnReference><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="SentUtc"></ColumnReference><ColumnReference Column="Segment1002"></ColumnReference></OutputList><RunTimeInformation><RunTimeCountersPerThread Thread="0" ActualRows="0" Batches="0" ActualElapsedms="0" ActualCPUms="0" ActualEndOfScans="1" ActualExecutions="1" ActualExecutionMode="Row"></RunTimeCountersPerThread></RunTimeInformation><Segment><GroupBy><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="TenantId"></ColumnReference><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="RecipientId"></ColumnReference></GroupBy><SegmentColumn><ColumnReference Column="Segment1002"></ColumnReference></SegmentColumn><RelOp NodeId="4" PhysicalOp="Index Scan" LogicalOp="Index Scan" EstimateRows="1" EstimatedRowsRead="1" EstimateIO="0.003125" EstimateCPU="0.0001581" AvgRowSize="28" EstimatedTotalSubtreeCost="0.0032831" TableCardinality="0" Parallel="0" EstimateRebinds="0" EstimateRewinds="0" EstimatedExecutionMode="Row"><OutputList><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="TenantId"></ColumnReference><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="RecipientId"></ColumnReference><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="MessageId"></ColumnReference><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="SentUtc"></ColumnReference></OutputList><RunTimeInformation><RunTimeCountersPerThread Thread="0" ActualRows="0" Batches="0" ActualElapsedms="0" ActualCPUms="0" ActualScans="1" ActualLogicalReads="0" ActualPhysicalReads="0" ActualReadAheads="0" ActualLobLogicalReads="0" ActualLobPhysicalReads="0" ActualLobReadAheads="0" ActualEndOfScans="1" ActualExecutions="1" ActualExecutionMode="Row"></RunTimeCountersPerThread></RunTimeInformation><IndexScan Ordered="1" ScanDirection="FORWARD" ForcedIndex="0" ForceSeek="0" ForceScan="0" NoExpandHint="0" Storage="RowStore"><DefinedValues><DefinedValue><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="TenantId"></ColumnReference></DefinedValue><DefinedValue><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="RecipientId"></ColumnReference></DefinedValue><DefinedValue><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="MessageId"></ColumnReference></DefinedValue><DefinedValue><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="SentUtc"></ColumnReference></DefinedValue></DefinedValues><Object Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Index="[IX]" Alias="[m]" IndexKind="NonClustered" Storage="RowStore"></Object><Predicate><ScalarOperator ScalarString="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457].[dbo].[Messages].[IsDeleted] as [m].[IsDeleted]=(0)"><Compare CompareOp="EQ"><ScalarOperator><Identifier><ColumnReference Database="[fiddle_45ce7bf2e41a4d56ae36e98bbdf2f457]" Schema="[dbo]" Table="[Messages]" Alias="[m]" Column="IsDeleted"></ColumnReference></Identifier></ScalarOperator><ScalarOperator><Const ConstValue="(0)"></Const></ScalarOperator></Compare></ScalarOperator></Predicate></IndexScan></RelOp></Segment></RelOp></Segment></RelOp></SequenceProject></RelOp><Predicate><ScalarOperator ScalarString="[Expr1001]=(1)"><Compare CompareOp="EQ"><ScalarOperator><Identifier><ColumnReference Column="Expr1001"></ColumnReference></Identifier></ScalarOperator><ScalarOperator><Const ConstValue="(1)"></Const></ScalarOperator></Compare></ScalarOperator></Predicate></Filter></RelOp></QueryPlan></StmtSimple></Statements></Batch></BatchSequence></ShowPlanXML>