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@NickCraver
Last active February 21, 2016 20:53
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Query Optimization: Literal Example
// Here's a normal query as you'd expect
db.QuerySingleOrDefault<PostCacheEntry>(@"SELECT
(Select Count(*) From Posts Where PostTypeId = @Question And DeletionDate Is Null) TotalQuestions,
(Select Count(*) From Posts Where PostTypeId = @Question And IsNull(IsAnswered, 0) = 0 And AcceptedAnswerId Is Null And ClosedDate Is Null And DeletionDate Is Null) TotalUnanswered,
(Select Count(*) From Posts Where PostTypeId = @Question And AcceptedAnswerId Is Not NulL And DeletionDate Is Null) TotalAccepted,
(Select Count(*) From Posts Where PostTypeId = @Answer And DeletionDate Is Null) TotalAnswers",
new { PostTypeId.Question, PostTypeId.Answer });
// In this case though, PostTypeId.Question and PostTypeId.Answer are values that never change.
// In this case they're constants, but this same trick works for enums.
// Instead of @Property in the query, using {=Property} will cause Dapper to do a literal replacement.
// This allows the SQL query optimizer to optimize for that one value that never changes much better.
// You're simply giving SQL more information to work with, and since it's constant we're dealing
// with the same number of plan cache entries.
// Note: for safety, this doesn't work on strings (since that could lead to injection)
db.QuerySingleOrDefault<PostCacheEntry>(@"SELECT
(Select Count(*) From Posts Where PostTypeId = {=Question} And DeletionDate Is Null) TotalQuestions,
(Select Count(*) From Posts Where PostTypeId = {=Question} And IsNull(IsAnswered, 0) = 0 And AcceptedAnswerId Is Null And ClosedDate Is Null And DeletionDate Is Null) TotalUnanswered,
(Select Count(*) From Posts Where PostTypeId = {=Question} And AcceptedAnswerId Is Not NulL And DeletionDate Is Null) TotalAccepted,
(Select Count(*) From Posts Where PostTypeId = {=Answer} And DeletionDate Is Null) TotalAnswers",
new { PostTypeId.Question, PostTypeId.Answer });
<?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="12.0.4422.0" xmlns="http://schemas.microsoft.com/sqlserver/2004/07/showplan">
<BatchSequence>
<Batch>
<Statements>
<StmtSimple StatementCompId="1" StatementEstRows="1" StatementId="1" StatementOptmLevel="FULL" CardinalityEstimationModelVersion="70" StatementSubTreeCost="543.455" StatementText="SELECT&#xD;&#xA; (Select Count(*) From Posts Where PostTypeId = 1 And DeletionDate Is Null) TotalQuestions,&#xD;&#xA; (Select Count(*) From Posts Where PostTypeId = 1 And IsNull(IsAnswered, 0) = 0 And AcceptedAnswerId Is Null And ClosedDate Is Null And DeletionDate Is Null) TotalUnanswered,&#xD;&#xA; (Select Count(*) From Posts Where PostTypeId = 1 And AcceptedAnswerId Is Not NulL And DeletionDate Is Null) TotalAccepted,&#xD;&#xA; (Select Count(*) From Posts Where PostTypeId = 2 And DeletionDate Is Null) TotalAnswers" StatementType="SELECT" QueryHash="0x73254019FEEF744F" QueryPlanHash="0x36E692B0E6ADA0AA" 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 DegreeOfParallelism="48" MemoryGrant="1782560" CachedPlanSize="120" CompileTime="27" CompileCPU="27" CompileMemory="2016">
<ThreadStat Branches="2" UsedThreads="96">
<ThreadReservation NodeId="0" ReservedThreads="48" />
<ThreadReservation NodeId="1" ReservedThreads="48" />
</ThreadStat>
<MissingIndexes>
<MissingIndexGroup Impact="49.0658">
<MissingIndex Database="[StackOverflow]" Schema="[dbo]" Table="[Posts]">
<ColumnGroup Usage="EQUALITY">
<Column Name="[PostTypeId]" ColumnId="2" />
<Column Name="[AcceptedAnswerId]" ColumnId="13" />
<Column Name="[DeletionDate]" ColumnId="22" />
<Column Name="[ClosedDate]" ColumnId="23" />
</ColumnGroup>
<ColumnGroup Usage="INCLUDE">
<Column Name="[IsAnswered]" ColumnId="38" />
</ColumnGroup>
</MissingIndex>
</MissingIndexGroup>
<MissingIndexGroup Impact="21.7629">
<MissingIndex Database="[StackOverflow]" Schema="[dbo]" Table="[Posts]">
<ColumnGroup Usage="EQUALITY">
<Column Name="[PostTypeId]" ColumnId="2" />
<Column Name="[DeletionDate]" ColumnId="22" />
</ColumnGroup>
<ColumnGroup Usage="INEQUALITY">
<Column Name="[AcceptedAnswerId]" ColumnId="13" />
</ColumnGroup>
</MissingIndex>
</MissingIndexGroup>
</MissingIndexes>
<MemoryGrantInfo SerialRequiredMemory="1024" SerialDesiredMemory="1656656" RequiredMemory="126752" DesiredMemory="1782560" RequestedMemory="1782560" GrantWaitTime="0" GrantedMemory="1782560" MaxUsedMemory="327680" />
<OptimizerHardwareDependentProperties EstimatedAvailableMemoryGrant="755848" EstimatedPagesCached="2267545" EstimatedAvailableDegreeOfParallelism="24" />
<RelOp AvgRowSize="23" EstimateCPU="1E-07" EstimateIO="0" EstimateRebinds="0" EstimateRewinds="0" EstimatedExecutionMode="Row" EstimateRows="1" LogicalOp="Compute Scalar" NodeId="0" Parallel="false" PhysicalOp="Compute Scalar" EstimatedTotalSubtreeCost="543.455">
<OutputList>
<ColumnReference Column="Expr1004" />
<ColumnReference Column="Expr1009" />
<ColumnReference Column="Expr1014" />
<ColumnReference Column="Expr1019" />
</OutputList>
<ComputeScalar>
<DefinedValues>
<DefinedValue>
<ColumnReference Column="Expr1004" />
<ScalarOperator ScalarString="[Expr1002]">
<Identifier>
<ColumnReference Column="Expr1002" />
</Identifier>
</ScalarOperator>
</DefinedValue>
<DefinedValue>
<ColumnReference Column="Expr1009" />
<ScalarOperator ScalarString="[Expr1007]">
<Identifier>
<ColumnReference Column="Expr1007" />
</Identifier>
</ScalarOperator>
</DefinedValue>
<DefinedValue>
<ColumnReference Column="Expr1014" />
<ScalarOperator ScalarString="[Expr1012]">
<Identifier>
<ColumnReference Column="Expr1012" />
</Identifier>
</ScalarOperator>
</DefinedValue>
<DefinedValue>
<ColumnReference Column="Expr1019" />
<ScalarOperator ScalarString="[Expr1017]">
<Identifier>
<ColumnReference Column="Expr1017" />
</Identifier>
</ScalarOperator>
</DefinedValue>
</DefinedValues>
<RelOp AvgRowSize="23" EstimateCPU="4.18E-06" EstimateIO="0" EstimateRebinds="0" EstimateRewinds="0" EstimatedExecutionMode="Row" EstimateRows="1" LogicalOp="Inner Join" NodeId="1" Parallel="false" PhysicalOp="Nested Loops" EstimatedTotalSubtreeCost="543.455">
<OutputList>
<ColumnReference Column="Expr1002" />
<ColumnReference Column="Expr1007" />
<ColumnReference Column="Expr1012" />
<ColumnReference Column="Expr1017" />
</OutputList>
<RunTimeInformation>
<RunTimeCountersPerThread Thread="0" ActualRows="1" ActualEndOfScans="1" ActualExecutions="1" />
</RunTimeInformation>
<NestedLoops Optimized="false">
<RelOp AvgRowSize="19" EstimateCPU="4.18E-06" EstimateIO="0" EstimateRebinds="0" EstimateRewinds="0" EstimatedExecutionMode="Row" EstimateRows="1" LogicalOp="Inner Join" NodeId="2" Parallel="false" PhysicalOp="Nested Loops" EstimatedTotalSubtreeCost="276.588">
<OutputList>
<ColumnReference Column="Expr1002" />
<ColumnReference Column="Expr1012" />
<ColumnReference Column="Expr1017" />
</OutputList>
<RunTimeInformation>
<RunTimeCountersPerThread Thread="0" ActualRows="1" ActualEndOfScans="1" ActualExecutions="1" />
</RunTimeInformation>
<NestedLoops Optimized="false">
<RelOp AvgRowSize="15" EstimateCPU="4.18E-06" EstimateIO="0" EstimateRebinds="0" EstimateRewinds="0" EstimatedExecutionMode="Row" EstimateRows="1" LogicalOp="Inner Join" NodeId="3" Parallel="false" PhysicalOp="Nested Loops" EstimatedTotalSubtreeCost="158.229">
<OutputList>
<ColumnReference Column="Expr1002" />
<ColumnReference Column="Expr1017" />
</OutputList>
<RunTimeInformation>
<RunTimeCountersPerThread Thread="0" ActualRows="1" ActualEndOfScans="1" ActualExecutions="1" />
</RunTimeInformation>
<NestedLoops Optimized="false">
<RelOp AvgRowSize="11" EstimateCPU="1E-07" EstimateIO="0" EstimateRebinds="0" EstimateRewinds="0" EstimatedExecutionMode="Row" EstimateRows="1" LogicalOp="Compute Scalar" NodeId="5" Parallel="false" PhysicalOp="Compute Scalar" EstimatedTotalSubtreeCost="64.1119">
<OutputList>
<ColumnReference Column="Expr1002" />
</OutputList>
<ComputeScalar>
<DefinedValues>
<DefinedValue>
<ColumnReference Column="Expr1002" />
<ScalarOperator ScalarString="CONVERT_IMPLICIT(int,[globalagg1021],0)">
<Convert DataType="int" Style="0" Implicit="true">
<ScalarOperator>
<Identifier>
<ColumnReference Column="globalagg1021" />
</Identifier>
</ScalarOperator>
</Convert>
</ScalarOperator>
</DefinedValue>
</DefinedValues>
<RelOp AvgRowSize="15" EstimateCPU="1.49E-05" EstimateIO="0" EstimateRebinds="0" EstimateRewinds="0" EstimatedExecutionMode="Row" EstimateRows="1" LogicalOp="Aggregate" NodeId="6" Parallel="false" PhysicalOp="Stream Aggregate" EstimatedTotalSubtreeCost="64.1119">
<OutputList>
<ColumnReference Column="globalagg1021" />
</OutputList>
<RunTimeInformation>
<RunTimeCountersPerThread Thread="0" ActualRows="1" ActualEndOfScans="1" ActualExecutions="1" />
</RunTimeInformation>
<StreamAggregate>
<DefinedValues>
<DefinedValue>
<ColumnReference Column="globalagg1021" />
<ScalarOperator ScalarString="SUM([partialagg1020])">
<Aggregate AggType="SUM" Distinct="false">
<ScalarOperator>
<Identifier>
<ColumnReference Column="partialagg1020" />
</Identifier>
</ScalarOperator>
</Aggregate>
</ScalarOperator>
</DefinedValue>
</DefinedValues>
<RelOp AvgRowSize="15" EstimateCPU="0.0285021" EstimateIO="0" EstimateRebinds="0" EstimateRewinds="0" EstimatedExecutionMode="Row" EstimateRows="24" LogicalOp="Gather Streams" NodeId="7" Parallel="true" PhysicalOp="Parallelism" EstimatedTotalSubtreeCost="64.1119">
<OutputList>
<ColumnReference Column="partialagg1020" />
</OutputList>
<RunTimeInformation>
<RunTimeCountersPerThread Thread="0" ActualRows="48" ActualEndOfScans="1" ActualExecutions="1" />
</RunTimeInformation>
<Parallelism>
<RelOp AvgRowSize="15" EstimateCPU="0.290336" EstimateIO="0" EstimateRebinds="0" EstimateRewinds="0" EstimatedExecutionMode="Row" EstimateRows="24" LogicalOp="Aggregate" NodeId="8" Parallel="true" PhysicalOp="Stream Aggregate" EstimatedTotalSubtreeCost="64.0834">
<OutputList>
<ColumnReference Column="partialagg1020" />
</OutputList>
<RunTimeInformation>
<RunTimeCountersPerThread Thread="1" ActualRows="1" Batches="0" ActualEndOfScans="1" ActualExecutions="1" ActualExecutionMode="Row" />
<RunTimeCountersPerThread Thread="23" ActualRows="1" Batches="0" ActualEndOfScans="1" ActualExecutions="1" ActualExecutionMode="Row" />
<RunTimeCountersPerThread Thread="43" ActualRows="1" Batches="0" ActualEndOfScans="1" ActualExecutions="1" ActualExecutionMode="Row" />
<RunTimeCountersPerThread Thread="48" ActualRows="1" Batches="0" ActualEndOfScans="1" ActualExecutions="1" ActualExecutionMode="Row" />
<RunTimeCountersPerThread Thread="42" ActualRows="1" Batches="0" ActualEndOfScans="1" ActualExecutions="1" ActualExecutionMode="Row" />
<RunTimeCountersPerThread Thread="40" ActualRows="1" Batches="0" ActualEndOfScans="1" ActualExecutions="1" ActualExecutionMode="Row" />
<RunTimeCountersPerThread Thread="32" ActualRows="1" Batches="0" ActualEndOfScans="1" ActualExecutions="1" ActualExecutionMode="Row" />
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<RunTimeCountersPerThread Thread="46" ActualRows="1" Batches="0" ActualEndOfScans="1" ActualExecutions="1" ActualExecutionMode="Row" />
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<RunTimeCountersPerThread Thread="12" ActualRows="1" Batches="0" ActualEndOfScans="1" ActualExecutions="1" ActualExecutionMode="Row" />
<RunTimeCountersPerThread Thread="11" ActualRows="1" Batches="0" ActualEndOfScans="1" ActualExecutions="1" ActualExecutionMode="Row" />
<RunTimeCountersPerThread Thread="10" ActualRows="1" Batches="0" ActualEndOfScans="1" ActualExecutions="1" ActualExecutionMode="Row" />
<RunTimeCountersPerThread Thread="9" ActualRows="1" Batches="0" ActualEndOfScans="1" ActualExecutions="1" ActualExecutionMode="Row" />
<RunTimeCountersPerThread Thread="4" ActualRows="1" Batches="0" ActualEndOfScans="1" ActualExecutions="1" ActualExecutionMode="Row" />
<RunTimeCountersPerThread Thread="8" ActualRows="1" Batches="0" ActualEndOfScans="1" ActualExecutions="1" ActualExecutionMode="Row" />
<RunTimeCountersPerThread Thread="7" ActualRows="1" Batches="0" ActualEndOfScans="1" ActualExecutions="1" ActualExecutionMode="Row" />
<RunTimeCountersPerThread Thread="13" ActualRows="1" Batches="0" ActualEndOfScans="1" ActualExecutions="1" ActualExecutionMode="Row" />
<RunTimeCountersPerThread Thread="3" ActualRows="1" Batches="0" ActualEndOfScans="1" ActualExecutions="1" ActualExecutionMode="Row" />
<RunTimeCountersPerThread Thread="0" ActualRows="0" ActualEndOfScans="0" ActualExecutions="0" />
</RunTimeInformation>
<StreamAggregate>
<DefinedValues>
<DefinedValue>
<ColumnReference Column="partialagg1020" />
<ScalarOperator ScalarString="Count(*)">
<Aggregate AggType="countstar" Distinct="false" />
</ScalarOperator>
</DefinedValue>
</DefinedValues>
<RelOp AvgRowSize="9" EstimateCPU="0.532289" EstimateIO="63.2608" EstimateRebinds="0" EstimateRewinds="0" EstimatedExecutionMode="Row" EstimateRows="11613400" LogicalOp="Index Seek" NodeId="9" Parallel="true" PhysicalOp="Index Seek" EstimatedTotalSubtreeCost="63.7931" TableCardinality="35508100">
<OutputList />
<RunTimeInformation>
<RunTimeCountersPerThread Thread="1" ActualRows="227671" Batches="0" ActualEndOfScans="1" ActualExecutions="1" ActualExecutionMode="Row" />
<RunTimeCountersPerThread Thread="23" ActualRows="235065" Batches="0" ActualEndOfScans="1" ActualExecutions="1" ActualExecutionMode="Row" />
<RunTimeCountersPerThread Thread="43" ActualRows="233954" Batches="0" ActualEndOfScans="1" ActualExecutions="1" ActualExecutionMode="Row" />
<RunTimeCountersPerThread Thread="48" ActualRows="231568" Batches="0" ActualEndOfScans="1" ActualExecutions="1" ActualExecutionMode="Row" />
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<Identifier>
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<RunTimeCountersPerThread Thread="17" ActualRows="86092" Batches="0" ActualEndOfScans="1" ActualExecutions="1" ActualExecutionMode="Row" />
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<RunTimeCountersPerThread Thread="6" ActualRows="88649" Batches="0" ActualEndOfScans="1" ActualExecutions="1" ActualExecutionMode="Row" />
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<RunTimeCountersPerThread Thread="0" ActualRows="0" ActualEndOfScans="0" ActualExecutions="0" />
</RunTimeInformation>
<IndexScan Ordered="true" ScanDirection="FORWARD" ForcedIndex="false" ForceSeek="false" ForceScan="false" NoExpandHint="false" Storage="RowStore">
<DefinedValues>
<DefinedValue>
<ColumnReference Database="[StackOverflow]" Schema="[dbo]" Table="[Posts]" Column="Id" />
</DefinedValue>
</DefinedValues>
<Object Database="[StackOverflow]" Schema="[dbo]" Table="[Posts]" Index="[Posts_PostTypeId_DeletionDate_CreationDate_IsAnswered]" TableReferenceId="2" IndexKind="NonClustered" Storage="RowStore" />
<SeekPredicates>
<SeekPredicateNew>
<SeekKeys>
<Prefix ScanType="EQ">
<RangeColumns>
<ColumnReference Database="[StackOverflow]" Schema="[dbo]" Table="[Posts]" Column="PostTypeId" />
<ColumnReference Database="[StackOverflow]" Schema="[dbo]" Table="[Posts]" Column="DeletionDate" />
</RangeColumns>
<RangeExpressions>
<ScalarOperator ScalarString="[@Question]">
<Identifier>
<ColumnReference Column="@Question" />
</Identifier>
</ScalarOperator>
<ScalarOperator ScalarString="NULL">
<Const ConstValue="NULL" />
</ScalarOperator>
</RangeExpressions>
</Prefix>
</SeekKeys>
</SeekPredicateNew>
</SeekPredicates>
<Predicate>
<ScalarOperator ScalarString="isnull([StackOverflow].[dbo].[Posts].[IsAnswered],(0))=(0)">
<Compare CompareOp="EQ">
<ScalarOperator>
<Intrinsic FunctionName="isnull">
<ScalarOperator>
<Identifier>
<ColumnReference Database="[StackOverflow]" Schema="[dbo]" Table="[Posts]" Column="IsAnswered" />
</Identifier>
</ScalarOperator>
<ScalarOperator>
<Const ConstValue="(0)" />
</ScalarOperator>
</Intrinsic>
</ScalarOperator>
<ScalarOperator>
<Const ConstValue="(0)" />
</ScalarOperator>
</Compare>
</ScalarOperator>
</Predicate>
</IndexScan>
</RelOp>
</Parallelism>
</RelOp>
</Hash>
</RelOp>
<RelOp AvgRowSize="11" EstimateCPU="0.332269" EstimateIO="0" EstimateRebinds="0" EstimateRewinds="0" EstimatedExecutionMode="Row" EstimateRows="3042440" LogicalOp="Repartition Streams" NodeId="59" Parallel="true" PhysicalOp="Parallelism" EstimatedTotalSubtreeCost="31.371">
<OutputList>
<ColumnReference Database="[StackOverflow]" Schema="[dbo]" Table="[Posts]" Column="Id" />
</OutputList>
<RunTimeInformation>
<RunTimeCountersPerThread Thread="24" ActualRows="98230" Batches="0" ActualEndOfScans="1" ActualExecutions="1" ActualExecutionMode="Row" />
<RunTimeCountersPerThread Thread="46" ActualRows="98703" Batches="0" ActualEndOfScans="1" ActualExecutions="1" ActualExecutionMode="Row" />
<RunTimeCountersPerThread Thread="45" ActualRows="98361" Batches="0" ActualEndOfScans="1" ActualExecutions="1" ActualExecutionMode="Row" />
<RunTimeCountersPerThread Thread="39" ActualRows="98619" Batches="0" ActualEndOfScans="1" ActualExecutions="1" ActualExecutionMode="Row" />
<RunTimeCountersPerThread Thread="26" ActualRows="97732" Batches="0" ActualEndOfScans="1" ActualExecutions="1" ActualExecutionMode="Row" />
<RunTimeCountersPerThread Thread="47" ActualRows="98294" Batches="0" ActualEndOfScans="1" ActualExecutions="1" ActualExecutionMode="Row" />
<RunTimeCountersPerThread Thread="44" ActualRows="98299" Batches="0" ActualEndOfScans="1" ActualExecutions="1" ActualExecutionMode="Row" />
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<RunTimeCountersPerThread Thread="35" ActualRows="98218" Batches="0" ActualEndOfScans="1" ActualExecutions="1" ActualExecutionMode="Row" />
<RunTimeCountersPerThread Thread="25" ActualRows="97423" Batches="0" ActualEndOfScans="1" ActualExecutions="1" ActualExecutionMode="Row" />
<RunTimeCountersPerThread Thread="41" ActualRows="97873" Batches="0" ActualEndOfScans="1" ActualExecutions="1" ActualExecutionMode="Row" />
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<RunTimeCountersPerThread Thread="37" ActualRows="98530" Batches="0" ActualEndOfScans="1" ActualExecutions="1" ActualExecutionMode="Row" />
<RunTimeCountersPerThread Thread="43" ActualRows="98375" Batches="0" ActualEndOfScans="1" ActualExecutions="1" ActualExecutionMode="Row" />
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<RunTimeCountersPerThread Thread="22" ActualRows="98189" Batches="0" ActualEndOfScans="1" ActualExecutions="1" ActualExecutionMode="Row" />
<RunTimeCountersPerThread Thread="19" ActualRows="98223" Batches="0" ActualEndOfScans="1" ActualExecutions="1" ActualExecutionMode="Row" />
<RunTimeCountersPerThread Thread="8" ActualRows="97995" Batches="0" ActualEndOfScans="1" ActualExecutions="1" ActualExecutionMode="Row" />
<RunTimeCountersPerThread Thread="21" ActualRows="98315" Batches="0" ActualEndOfScans="1" ActualExecutions="1" ActualExecutionMode="Row" />
<RunTimeCountersPerThread Thread="7" ActualRows="98229" Batches="0" ActualEndOfScans="1" ActualExecutions="1" ActualExecutionMode="Row" />
<RunTimeCountersPerThread Thread="13" ActualRows="97731" Batches="0" ActualEndOfScans="1" ActualExecutions="1" ActualExecutionMode="Row" />
<RunTimeCountersPerThread Thread="10" ActualRows="98260" Batches="0" ActualEndOfScans="1" ActualExecutions="1" ActualExecutionMode="Row" />
<RunTimeCountersPerThread Thread="9" ActualRows="98802" Batches="0" ActualEndOfScans="1" ActualExecutions="1" ActualExecutionMode="Row" />
<RunTimeCountersPerThread Thread="2" ActualRows="97933" Batches="0" ActualEndOfScans="1" ActualExecutions="1" ActualExecutionMode="Row" />
<RunTimeCountersPerThread Thread="15" ActualRows="98818" Batches="0" ActualEndOfScans="1" ActualExecutions="1" ActualExecutionMode="Row" />
<RunTimeCountersPerThread Thread="11" ActualRows="97920" Batches="0" ActualEndOfScans="1" ActualExecutions="1" ActualExecutionMode="Row" />
<RunTimeCountersPerThread Thread="0" ActualRows="0" ActualEndOfScans="0" ActualExecutions="0" />
</RunTimeInformation>
<Parallelism PartitioningType="Hash">
<PartitionColumns>
<ColumnReference Database="[StackOverflow]" Schema="[dbo]" Table="[Posts]" Column="Id" />
</PartitionColumns>
<RelOp AvgRowSize="23" EstimateCPU="0.139452" EstimateIO="30.7877" EstimateRebinds="0" EstimateRewinds="0" EstimatedExecutionMode="Row" EstimateRows="3042440" LogicalOp="Index Seek" NodeId="60" Parallel="true" PhysicalOp="Index Seek" EstimatedTotalSubtreeCost="30.9272" TableCardinality="35508700">
<OutputList>
<ColumnReference Database="[StackOverflow]" Schema="[dbo]" Table="[Posts]" Column="Id" />
</OutputList>
<RunTimeInformation>
<RunTimeCountersPerThread Thread="43" ActualRows="59611" Batches="0" ActualEndOfScans="1" ActualExecutions="1" ActualExecutionMode="Row" />
<RunTimeCountersPerThread Thread="19" ActualRows="100544" Batches="0" ActualEndOfScans="1" ActualExecutions="1" ActualExecutionMode="Row" />
<RunTimeCountersPerThread Thread="15" ActualRows="96313" Batches="0" ActualEndOfScans="1" ActualExecutions="1" ActualExecutionMode="Row" />
<RunTimeCountersPerThread Thread="4" ActualRows="99233" Batches="0" ActualEndOfScans="1" ActualExecutions="1" ActualExecutionMode="Row" />
<RunTimeCountersPerThread Thread="17" ActualRows="94112" Batches="0" ActualEndOfScans="1" ActualExecutions="1" ActualExecutionMode="Row" />
<RunTimeCountersPerThread Thread="21" ActualRows="102935" Batches="0" ActualEndOfScans="1" ActualExecutions="1" ActualExecutionMode="Row" />
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<RunTimeCountersPerThread Thread="11" ActualRows="101521" Batches="0" ActualEndOfScans="1" ActualExecutions="1" ActualExecutionMode="Row" />
<RunTimeCountersPerThread Thread="2" ActualRows="106301" Batches="0" ActualEndOfScans="1" ActualExecutions="1" ActualExecutionMode="Row" />
<RunTimeCountersPerThread Thread="0" ActualRows="0" ActualEndOfScans="0" ActualExecutions="0" />
</RunTimeInformation>
<IndexScan Ordered="true" ScanDirection="FORWARD" ForcedIndex="false" ForceSeek="false" ForceScan="false" NoExpandHint="false" Storage="RowStore">
<DefinedValues>
<DefinedValue>
<ColumnReference Database="[StackOverflow]" Schema="[dbo]" Table="[Posts]" Column="Id" />
</DefinedValue>
</DefinedValues>
<Object Database="[StackOverflow]" Schema="[dbo]" Table="[Posts]" Index="[Posts_PostTypeId_DeletionDate_Includes]" TableReferenceId="2" IndexKind="NonClustered" Storage="RowStore" />
<SeekPredicates>
<SeekPredicateNew>
<SeekKeys>
<Prefix ScanType="EQ">
<RangeColumns>
<ColumnReference Database="[StackOverflow]" Schema="[dbo]" Table="[Posts]" Column="PostTypeId" />
<ColumnReference Database="[StackOverflow]" Schema="[dbo]" Table="[Posts]" Column="DeletionDate" />
</RangeColumns>
<RangeExpressions>
<ScalarOperator ScalarString="[@Question]">
<Identifier>
<ColumnReference Column="@Question" />
</Identifier>
</ScalarOperator>
<ScalarOperator ScalarString="NULL">
<Const ConstValue="NULL" />
</ScalarOperator>
</RangeExpressions>
</Prefix>
</SeekKeys>
</SeekPredicateNew>
</SeekPredicates>
<Predicate>
<ScalarOperator ScalarString="[StackOverflow].[dbo].[Posts].[AcceptedAnswerId] IS NULL AND [StackOverflow].[dbo].[Posts].[ClosedDate] IS NULL">
<Logical Operation="AND">
<ScalarOperator>
<Compare CompareOp="IS">
<ScalarOperator>
<Identifier>
<ColumnReference Database="[StackOverflow]" Schema="[dbo]" Table="[Posts]" Column="AcceptedAnswerId" />
</Identifier>
</ScalarOperator>
<ScalarOperator>
<Const ConstValue="NULL" />
</ScalarOperator>
</Compare>
</ScalarOperator>
<ScalarOperator>
<Compare CompareOp="IS">
<ScalarOperator>
<Identifier>
<ColumnReference Database="[StackOverflow]" Schema="[dbo]" Table="[Posts]" Column="ClosedDate" />
</Identifier>
</ScalarOperator>
<ScalarOperator>
<Const ConstValue="NULL" />
</ScalarOperator>
</Compare>
</ScalarOperator>
</Logical>
</ScalarOperator>
</Predicate>
</IndexScan>
</RelOp>
</Parallelism>
</RelOp>
</Hash>
</RelOp>
</StreamAggregate>
</RelOp>
</Parallelism>
</RelOp>
</StreamAggregate>
</RelOp>
</ComputeScalar>
</RelOp>
</NestedLoops>
</RelOp>
</ComputeScalar>
</RelOp>
<ParameterList>
<ColumnReference Column="@Answer" ParameterRuntimeValue="(2)" />
<ColumnReference Column="@Question" ParameterRuntimeValue="(1)" />
</ParameterList>
</QueryPlan>
</StmtSimple>
</Statements>
</Batch>
</BatchSequence>
</ShowPlanXML>
-- Parameterized Version
Declare @Question tinyint = 1,
@Answer tinyint = 2;
SELECT
(Select Count(*) From Posts Where PostTypeId = @Question And DeletionDate Is Null) TotalQuestions,
(Select Count(*) From Posts Where PostTypeId = @Question And IsNull(IsAnswered, 0) = 0 And AcceptedAnswerId Is Null And ClosedDate Is Null And DeletionDate Is Null) TotalUnanswered,
(Select Count(*) From Posts Where PostTypeId = @Question And AcceptedAnswerId Is Not NulL And DeletionDate Is Null) TotalAccepted,
(Select Count(*) From Posts Where PostTypeId = @Answer And DeletionDate Is Null) TotalAnswers
--Table 'Posts'. Scan count 294, logical reads 812459, physical reads 0, read-ahead reads 22592, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.
--Table 'Workfile'. Scan count 0, logical reads 0, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.
--Table 'Worktable'. Scan count 0, logical reads 0, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.
-- SQL Server Execution Times:
-- CPU time = 32996 ms, elapsed time = 1106 ms.
-- Literal Version
SELECT
(Select Count(*) From Posts Where PostTypeId = 1 And DeletionDate Is Null) TotalQuestions,
(Select Count(*) From Posts Where PostTypeId = 1 And IsNull(IsAnswered, 0) = 0 And AcceptedAnswerId Is Null And ClosedDate Is Null And DeletionDate Is Null) TotalUnanswered,
(Select Count(*) From Posts Where PostTypeId = 1 And AcceptedAnswerId Is Not NulL And DeletionDate Is Null) TotalAccepted,
(Select Count(*) From Posts Where PostTypeId = 2 And DeletionDate Is Null) TotalAnswers
--Table 'Posts'. Scan count 245, logical reads 788715, physical reads 0, read-ahead reads 1, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.
--Table 'Workfile'. Scan count 0, logical reads 0, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.
--Table 'Worktable'. Scan count 0, logical reads 0, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.
-- SQL Server Execution Times:
-- CPU time = 24004 ms, elapsed time = 852 ms.
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