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QueryPerformanceTuningDistilled.sql
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QueryPerformanceTuningDistilled.sql
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/* SQL Server 2012 Query Performance Tuning Distilled
Code Listing */
/* Each chapter starts with a chapter head. Then specified
code within the chapter will refer to a comment associated
with the code from that chapter. Most of the specifications
are unique, but some might not be. Be sure you're looking
for the correct chapter first.*/
--Chapter 2
SELECT dopc.cntr_value,
dopc.cntr_type
FROM sys.dm_os_performance_counters AS dopc
WHERE dopc.object_name = 'MSSQL$RANDORI:General Statistics'
AND dopc.counter_name = 'Logins/sec' ;
SELECT *
FROM sys.dm_os_performance_counters
SELECT TOP (10)
dows.*
FROM sys.dm_os_wait_stats AS dows
ORDER BY dows.wait_time_ms DESC ;
EXEC sp_configure
'show advanced options',
1 ;
GO
RECONFIGURE ;
GO
EXEC sp_configure
'min server memory' ;
EXEC sp_configure
'max server memory' ;
USE master ;
EXEC sp_configure
'show advanced option',
1 ;
RECONFIGURE ;
EXEC sp_configure
'min server memory (MB)',
128 ;
EXEC sp_configure
'max server memory (MB)',
200 ;
RECONFIGURE WITH OVERRIDE ;
--File Group
ALTER DATABASE AdventureWorks2008R2 ADD FILEGROUP INDEXES ;
ALTER DATABASE AdventureWorks2008R2 ADD FILE (NAME = AdventureWorks2008_Data2j,
FILENAME = 'C:\DATA\AdventureWorks2008_2.ndf',
SIZE = 1mb,
FILEGROWTH = 10%) TO FILEGROUP Indexes ;
--Example
SELECT jc.JobCandidateID,
e.ModifiedDate
FROM HumanResources.JobCandidate AS jc
INNER JOIN HumanResources.Employee AS e
ON jc.BusinessEntityID = e.BusinessEntityID ;
--FileMove
USE master ;
GO
sp_detach_db
'AdventureWorks2008' ;
GO
USE master ;
GO
sp_attach_db
'AdventureWorks2008R2',
'C:\DATA\AdventureWorks2008.mdf',
'F:\DATA\AdventureWorks2008_2.ndf ',
'C:\DATA\AdventureWorks2008.IDf ' ;
GO
USE Adventureworks2008R2
GO
SELECT *
FROM sys.database_files ;
GO
--example index
CREATE INDEX IndexBirthDate
ON HumanResources.Employee (BirthDate)
ON Indexes ;
--Chapter 3
SELECT dxs.name,
dxs.create_time
FROM sys.dm_xe_sessions AS dxs ;
SELECT *
FROM sys.fn_xe_file_target_read_file('C:\Program Files\Microsoft SQL Server\MSSQL11.RANDORI\MSSQL\Log\Query Performance Tuning*.xel',
NULL, NULL, NULL) ;
WITH xEvents
AS (SELECT object_name AS xEventName,
CAST (event_data AS XML) AS xEventData
FROM sys.fn_xe_file_target_read_file('C:\Program Files\Microsoft SQL Server\MSSQL11.RANDORI\MSSQL\Log\Query Performance Tuning*.xel',
NULL, NULL, NULL)
)
SELECT xEventName,
xEventData.value('(/event/data[@name=''duration'']/value)[1]',
'bigint') Duration,
xEventData.value('(/event/data[@name=''physical_reads'']/value)[1]',
'bigint') PhysicalReads,
xEventData.value('(/event/data[@name=''logical_reads'']/value)[1]',
'bigint') LogicalReads,
xEventData.value('(/event/data[@name=''cpu_time'']/value)[1]',
'bigint') CpuTime,
xEventData.value('(/event/data[@name=''batch_text'']/value)[1]',
'varchar(max)') BatchText,
xEventData.value('(/event/data[@name=''statement'']/value)[1]',
'varchar(max)') StatementText,
xEventData.value('(/event/data[@name=''query_plan_hash'']/value)[1]',
'binary(8)') QueryPlanHash
FROM xEvents
ORDER BY LogicalReads DESC ;
USE TestDB ;
GO
WITH xEvents
AS (SELECT object_name AS xEventName,
CAST (event_data AS XML) AS xEventData
FROM sys.fn_xe_file_target_read_file('C:\Program Files\Microsoft SQL Server\MSSQL11.RANDORI\MSSQL\Log\Query Performance Tuning*.xel',
NULL, NULL, NULL)
)
SELECT xEventName,
xEventData.value('(/event/data[@name=''duration'']/value)[1]',
'bigint') Duration,
xEventData.value('(/event/data[@name=''physical_reads'']/value)[1]',
'bigint') PhysicalReads,
xEventData.value('(/event/data[@name=''logical_reads'']/value)[1]',
'bigint') LogicalReads,
xEventData.value('(/event/data[@name=''cpu_time'']/value)[1]',
'bigint') CpuTime,
CASE xEventName
WHEN 'sql_batch_completed'
THEN xEventData.value('(/event/data[@name=''batch_text'']/value)[1]',
'varchar(max)')
WHEN 'rpc_completed'
THEN xEventData.value('(/event/data[@name=''statement'']/value)[1]',
'varchar(max)')
END AS SQLText,
xEventData.value('(/event/data[@name=''query_plan_hash'']/value)[1]',
'binary(8)') QueryPlanHash
--INTO Session_Table
FROM xEvents ;
USE TestDB ;
GO
SELECT COUNT(*) AS TotalExecutions,
st.xEventName,
st.BatchText,
SUM(st.Duration) AS DurationTotal,
SUM(st.CpuTime) AS CpuTotal,
SUM(st.LogicalReads) AS LogicalReadTotal,
SUM(st.PhysicalReads) AS PhysicalReadTotal
FROM Session_Table AS st
GROUP BY st.xEventName,
st.BatchText
ORDER BY LogicalReadTotal DESC ;
SELECT ss.sum_execution_count,
t.TEXT,
ss.sum_total_elapsed_time,
ss.sum_total_worker_time,
ss.sum_total_logical_reads,
ss.sum_total_logical_writes
FROM (SELECT s.plan_handle,
SUM(s.execution_count) sum_execution_count,
SUM(s.total_elapsed_time) sum_total_elapsed_time,
SUM(s.total_worker_time) sum_total_worker_time,
SUM(s.total_logical_reads) sum_total_logical_reads,
SUM(s.total_logical_writes) sum_total_logical_writes
FROM sys.dm_exec_query_stats s
GROUP BY s.plan_handle
) AS ss
CROSS APPLY sys.dm_exec_sql_text(ss.plan_handle) t
ORDER BY sum_total_logical_reads DESC
WITH xEvents
AS (SELECT object_name AS xEventName,
CAST (event_data AS XML) AS xEventData
FROM sys.fn_xe_file_target_read_file('C:\Program Files\Microsoft SQL Server\MSSQL11.RANDORI\MSSQL\Log\Query Performance Tuning*.xel',
NULL, NULL, NULL)
)
SELECT xEventName,
xEventData.value('(/event/data[@name=''duration'']/value)[1]',
'bigint') Duration,
xEventData.value('(/event/data[@name=''physical_reads'']/value)[1]',
'bigint') PhysicalReads,
xEventData.value('(/event/data[@name=''logical_reads'']/value)[1]',
'bigint') LogicalReads,
xEventData.value('(/event/data[@name=''cpu_time'']/value)[1]',
'bigint') CpuTime,
xEventData.value('(/event/data[@name=''batch_text'']/value)[1]',
'varchar(max)') BatchText,
xEventData.value('(/event/data[@name=''query_plan_hash'']/value)[1]',
'binary(8)') QueryPlanHash
FROM xEvents
ORDER BY Duration DESC ;
USE AdventureWorks2008R2 ;
GO
--set showplan_xml
SET SHOWPLAN_XML ON
GO
SELECT soh.AccountNumber,
sod.LineTotal,
sod.OrderQty,
sod.UnitPrice,
p.Name
FROM Sales.SalesOrderHeader soh
JOIN Sales.SalesOrderDetail sod
ON soh.SalesOrderID = sod.SalesOrderID
JOIN Production.Product p
ON sod.ProductID = p.ProductID
WHERE sod.LineTotal > 1000 ;
GO
SET SHOWPLAN_XML OFF
GO
SELECT soh.AccountNumber,
sod.LineTotal,
sod.OrderQty,
sod.UnitPrice,
p.Name
FROM Sales.SalesOrderHeader soh
JOIN Sales.SalesOrderDetail sod
ON soh.SalesOrderID = sod.SalesOrderID
JOIN Production.Product p
ON sod.ProductID = p.ProductID
WHERE sod.LineTotal > 20000 ;
--hash
SELECT p.*
FROM Production.Product p
JOIN Production.ProductCategory pc
ON p.ProductSubcategoryID = pc.ProductCategoryID ;
--merge
SELECT pm.*
FROM Production.ProductModel pm
JOIN Production.ProductModelProductDescriptionCulture pmpd
ON pm.ProductModelID = pmpd.ProductModelID ;
--loop
SELECT soh.*
FROM Sales.SalesOrderHeader soh
JOIN Sales.SalesOrderDetail sod
ON soh.SalesOrderID = sod.SalesOrderID
WHERE soh.SalesOrderID = 71832 ;
--example proc
IF (SELECT OBJECT_ID('p1')
) IS NOT NULL
DROP PROC p1
GO
CREATE PROC p1
AS
CREATE TABLE dbo.Test1 (C1 INT) ;
INSERT INTO dbo.Test1
SELECT ProductID
FROM Production.Product ;
SELECT *
FROM dbo.Test1 ;
DROP TABLE dbo.Test1 ;
GO
SET SHOWPLAN_XML ON
GO
EXEC p1 ;
GO
SET SHOWPLAN_XML OFF
GO
SET STATISTICS XML ON
GO
EXEC p1 ;
GO
SET STATISTICS XML OFF
GO
--plan cache
SELECT p.query_plan,
t.text
FROM sys.dm_exec_cached_plans r
CROSS APPLY sys.dm_exec_query_plan(r.plan_handle) p
CROSS APPLY sys.dm_exec_sql_text(r.plan_handle) t ;
SELECT TOP 100
p.*
FROM Production.Product p ;
SET STATISTICS TIME ON
GO
SELECT soh.AccountNumber,
sod.LineTotal,
sod.OrderQty,
sod.UnitPrice,
p.Name
FROM Sales.SalesOrderHeader soh
JOIN Sales.SalesOrderDetail sod
ON soh.SalesOrderID = sod.SalesOrderID
JOIN Production.Product p
ON sod.ProductID = p.ProductID
WHERE sod.LineTotal > 1000 ;
GO
SET STATISTICS TIME OFF
GO
DBCC freeproccache()
SET STATISTICS IO ON
GO
SELECT soh.AccountNumber,
sod.LineTotal,
sod.OrderQty,
sod.UnitPrice,
p.Name
FROM Sales.SalesOrderHeader soh
JOIN Sales.SalesOrderDetail sod
ON soh.SalesOrderID = sod.SalesOrderID
JOIN Production.Product p
ON sod.ProductID = p.ProductID
WHERE sod.SalesOrderID = 71856 ;
GO
SET STATISTICS IO OFF
GO
--Chapter 4
SELECT TOP 10
p.ProductID,
p.[Name],
p.StandardCost,
p.[Weight],
ROW_NUMBER() OVER (ORDER BY p.Name DESC) AS RowNumber
FROM Production.Product p ;
SELECT TOP 10
p.ProductID,
p.[Name],
p.StandardCost,
p.[Weight],
ROW_NUMBER() OVER (ORDER BY p.Name DESC) AS RowNumber
FROM Production.Product p
WHERE p.StandardCost > 150
ORDER BY p.StandardCost ;
--index test
IF (SELECT OBJECT_ID('dbo.Test1')
) IS NOT NULL
DROP TABLE dbo.Test1 ;
GO
CREATE TABLE dbo.Test1
(C1 INT,
C2 INT,
C3 VARCHAR(50)
) ;
WITH Nums
AS (SELECT TOP (10000)
ROW_NUMBER() OVER (ORDER BY (SELECT 1
)) AS n
FROM Master.sys.All_Columns aC1
CROSS JOIN Master.sys.ALL_Columns aC2
)
INSERT INTO dbo.Test1
(C1, C2, C3)
SELECT n,
n,
'C3'
FROM Nums ;
UPDATE dbo.Test1
SET C1 = 1,
C2 = 1
WHERE C2 = 1 ;
CREATE CLUSTERED INDEX iTest
ON dbo.Test1(C1) ;
CREATE INDEX iTest2
ON dbo.Test1(C2) ;
SELECT p.ProductID,
p.Name,
p.StandardCost,
p.Weight
FROM Production.Product p ;
SELECT p.ProductID,
p.Name,
p.StandardCost,
p.Weight
FROM Production.Product AS p
WHERE p.ProductID = 738 ;
--Page Size
IF (SELECT OBJECT_ID('dbo.Test1')
) IS NOT NULL
DROP TABLE dbo.Test1 ;
GO
CREATE TABLE dbo.Test1 (C1 INT, C2 INT) ;
WITH Nums
AS (SELECT 1 AS n
UNION ALL
SELECT n + 1
FROM Nums
WHERE n < 20
)
INSERT INTO dbo.Test1
(C1, C2)
SELECT n,
2
FROM Nums ;
CREATE INDEX iTest ON dbo.Test1(C1) ;
--check the page size
SELECT i.Name,
i.type_desc,
ddips.page_count,
ddips.record_count,
ddips.index_level
FROM sys.indexes i
JOIN sys.dm_db_index_physical_stats(DB_ID(N'AdventureWorks2008R2'),
OBJECT_ID(N'dbo.Test1'), NULL, NULL,
'DETAILED') AS ddips
ON i.index_id = ddips.index_id
WHERE i.object_id = OBJECT_ID(N'dbo.Test1') ;
-- modify the structure
DROP INDEX dbo.Test1.iTest ;
ALTER TABLE dbo.Test1 ALTER COLUMN C1 CHAR(500) ;
CREATE INDEX iTest ON dbo.Test1(C1) ;
DROP TABLE dbo.t1Test1 ;
--Determining Selectivity
SELECT COUNT(DISTINCT e.Gender) AS DistinctColValues,
COUNT(e.Gender) AS NumberOfRows,
(CAST(COUNT(DISTINCT e.Gender) AS DECIMAL)
/ CAST(COUNT(e.Gender) AS DECIMAL)) AS Selectivity
FROM HumanResources.Employee AS e ;
--Selectivity example
SELECT e.*
FROM HumanResources.Employee AS e
WHERE e.Gender = 'F'
AND e.SickLeaveHours = 59
AND e.MaritalStatus = 'M' ;
--Selectivity Index
CREATE INDEX IX_Employee_Test ON HumanResources.Employee (Gender) ;
-- Selectivity Index 2
CREATE INDEX IX_Employee_Test ON
HumanResources.Employee (SickLeaveHours, Gender, MaritalStatus)
WITH (DROP_EXISTING = ON) ;
-- Original index
CREATE INDEX IX_Employee_Test ON HumanResources.Employee (Gender)
WITH (DROP_EXISTING = ON) ;
--Selectivity query with hint
SELECT e.*
FROM HumanResources.Employee AS e WITH (INDEX (IX_Employee_Test))
WHERE e.SickLeaveHours = 59
AND e.Gender = 'F'
AND e.MaritalStatus = 'M' ;
SELECT e.*
FROM HumanResources.Employee AS e WITH (FORCESEEK)
WHERE e.SickLeaveHours = 59
AND e.Gender = 'F'
AND e.MaritalStatus = 'M' ;
--cleanup
DROP INDEX HumanResources.Employee.IX_Employee_Test ;
--Column Order
--Sample index
CREATE INDEX IX_Test ON Person.Address (City, PostalCode) ;
--query using the leading edge
SELECT a.*
FROM Person.Address AS a
WHERE a.City = 'Warrington' ;
--query using a different column
SELECT a.*
FROM Person.Address AS a
WHERE a.PostalCode = 'WA3 7BH' ;
--Query using only index columns
SELECT a.AddressID,
a.City,
a.PostalCode
FROM Person.Address AS a
WHERE a.City = 'Warrington'
AND a.PostalCode = 'WA3 7BH' ;
--clustered and non-clustered indexes
SELECT dl.DatabaseLogID,
dl.PostTime
FROM dbo.DatabaseLog AS dl
WHERE dl.DatabaseLogID = 115 ;
SELECT d.DepartmentID,
d.ModifiedDate
FROM HumanResources.Department AS d
WHERE d.DepartmentID = 10 ;
--clustered index width
IF (SELECT OBJECT_ID('dbo.Test1')
) IS NOT NULL
DROP TABLE dbo.Test1 ;
GO
CREATE TABLE dbo.Test1 (C1 INT, C2 INT) ;
WITH Nums
AS (SELECT TOP (20)
ROW_NUMBER() OVER (ORDER BY (SELECT 1
)) AS n
FROM Master.sys.All_Columns aC1
CROSS JOIN Master.sys.ALL_Columns aC2
)
INSERT INTO dbo.Test1
(C1, C2)
SELECT n,
n + 1
FROM Nums ;
CREATE CLUSTERED INDEX iClustered
ON dbo.Test1 (C2) ;
CREATE NONCLUSTERED INDEX iNonClustered
ON dbo.Test1 (C1) ;
SELECT i.name,
i.type_desc,
s.page_count,
s.record_count,
s.index_level
FROM sys.indexes i
JOIN sys.dm_db_index_physical_stats(DB_ID(N'AdventureWorks2008R2'),
OBJECT_ID(N'dbo.Test1'), NULL, NULL,
'DETAILED') AS s
ON i.index_id = s.index_id
WHERE i.object_id = OBJECT_ID(N'dbo.Test1') ;
DROP INDEX dbo.Test1.iClustered ;
ALTER TABLE dbo.Test1 ALTER COLUMN C2 CHAR(500) ;
CREATE CLUSTERED INDEX iClustered ON dbo.Test1(C2) ;
--Create Sort
IF (SELECT OBJECT_ID('od')
) IS NOT NULL
DROP TABLE dbo.od ;
GO
SELECT pod.*
INTO dbo.od
FROM Purchasing.PurchaseOrderDetail AS pod ;
EXEC sp_helpindex
'dbo.od' ;
SELECT od.*
FROM dbo.od
WHERE od.ProductID BETWEEN 500 AND 510
ORDER BY od.ProductID ;
CREATE CLUSTERED INDEX i1 ON od(ProductID) ;
DROP INDEX od.i1 ;
CREATE NONCLUSTERED INDEX i1 ON dbo.od(ProductID) ;
DROP TABLE dbo.od ;
--updates on clustered index
BEGIN TRAN
SET STATISTICS IO ON ;
UPDATE Sales.SpecialOfferProduct
SET ProductID = 345
WHERE SpecialOfferID = 1
AND ProductID = 720 ;
SET STATISTICS IO OFF ;
ROLLBACK TRAN
CREATE NONCLUSTERED INDEX ixTest
ON Sales.SpecialOfferProduct (ModifiedDate) ;
DROP INDEX Sales.SpecialOfferProduct.ixTest ;
--Clustered index benefits
IF (SELECT OBJECT_ID('dbo.Test1')
) IS NOT NULL
DROP TABLE dbo.Test1 ;
GO
CREATE TABLE dbo.Test1 (C1 INT, C2 INT) ;
WITH Nums
AS (SELECT TOP (10000)
ROW_NUMBER() OVER (ORDER BY (SELECT 1
)) AS n
FROM Master.sys.all_columns AS aC1
CROSS JOIN Master.sys.all_columns AS aC2
)
INSERT INTO dbo.Test1
(C1, C2)
SELECT n,
2
FROM Nums ;
SELECT C1,
C2
FROM dbo.Test1 AS t
WHERE C1 = 1000 ;
CREATE NONCLUSTERED INDEX incl ON dbo.Test1(C1) ;
CREATE CLUSTERED INDEX icl ON dbo.Test1(C1) ;
--nonclustered index benefits
SELECT cc.CreditCardID,
cc.CardNumber,
cc.ExpMonth,
cc.ExpYear
FROM Sales.CreditCard cc
WHERE cc.ExpMonth BETWEEN 6 AND 9
AND cc.ExpYear = 2008
ORDER BY cc.ExpMonth ;
CREATE NONCLUSTERED INDEX ixTest
ON Sales.CreditCard (ExpMonth, ExpYear)
INCLUDE (CardNumber) ;
DROP INDEX Sales.CreditCard.ixTest ;
--covering indexes
SELECT a.PostalCode
FROM Person.Address AS a
WHERE a.StateProvinceID = 42 ;
CREATE NONCLUSTERED INDEX [IX_Address_StateProvinceID]
ON [Person].[Address] ([StateProvinceID] ASC)
INCLUDE (PostalCode)
WITH (
DROP_EXISTING = ON) ;
--Index intersectoin:
SELECT soh.*
FROM Sales.SalesOrderHeader AS soh
WHERE soh.SalesPersonID = 276
AND soh.OrderDate BETWEEN '4/1/2005' AND '7/1/2005' ;
CREATE NONCLUSTERED INDEX IX_Test
ON Sales.SalesOrderHeader (OrderDate) ;
DROP INDEX Sales.SalesOrderHeader.IX_Test ;
--Index Join
SELECT soh.SalesPersonID,
soh.OrderDate
FROM Sales.SalesOrderHeader AS soh
WHERE soh.SalesPersonID = 276
AND soh.OrderDate BETWEEN '4/1/2005' AND '7/1/2005' ;
CREATE NONCLUSTERED INDEX IX_Test
ON Sales.SalesOrderHeader ([OrderDate] ASC) ;
DROP INDEX Sales.SalesOrderHeader.IX_Test
--Filtered index
SELECT soh.PurchaseOrderNumber,
soh.OrderDate,
soh.ShipDate,
soh.SalesPersonID
FROM Sales.SalesOrderHeader AS soh
WHERE PurchaseOrderNumber LIKE 'PO5%'
AND soh.SalesPersonID IS NOT NULL ;
CREATE NONCLUSTERED INDEX IX_Test
ON Sales.SalesOrderHeader(PurchaseOrderNumber ,SalesPersonID)
INCLUDE (OrderDate,ShipDate) ;
CREATE NONCLUSTERED INDEX IX_Test
ON Sales.SalesOrderHeader(PurchaseOrderNumber,SalesPersonID)
INCLUDE (OrderDate,ShipDate)
WHERE PurchaseOrderNumber IS NOT NULL AND SalesPersonID IS NOT NULL
WITH (DROP_EXISTING = ON) ;
DROP INDEX Sales.SalesOrderHeader.IX_Test ;
--Indexed views
--Query 1
SELECT p.[Name] AS ProductName,
SUM(pod.OrderQty) AS OrderOty,
SUM(pod.ReceivedQty) AS ReceivedOty,
SUM(pod.RejectedQty) AS RejectedOty
FROM Purchasing.PurchaseOrderDetail AS pod
JOIN Production.Product AS p
ON p.ProductID = pod.ProductID
GROUP BY p.[Name] ;
--Query 2
SELECT p.[Name] AS ProductName,
SUM(pod.OrderQty) AS OrderOty,
SUM(pod.ReceivedQty) AS ReceivedOty,
SUM(pod.RejectedQty) AS RejectedOty
FROM Purchasing.PurchaseOrderDetail AS pod
JOIN Production.Product AS p
ON p.ProductID = pod.ProductID
GROUP BY p.[Name]
HAVING (SUM(pod.RejectedQty) / SUM(pod.ReceivedQty)) > .08 ;
--Query 3
SELECT p.[Name] AS ProductName,
SUM(pod.OrderQty) AS OrderQty,
SUM(pod.ReceivedQty) AS ReceivedQty,
SUM(pod.RejectedQty) AS RejectedQty
FROM Purchasing.PurchaseOrderDetail AS pod
JOIN Production.Product AS p
ON p.ProductID = pod.ProductID
WHERE p.[Name] LIKE 'Chain%'
GROUP BY p.[Name] ;
--view
IF EXISTS ( SELECT *
FROM sys.views
WHERE object_id = OBJECT_ID(N'[Purchasing].[IndexedView]') )
DROP VIEW [Purchasing].[IndexedView] ;
GO
CREATE VIEW Purchasing.IndexedView
WITH SCHEMABINDING
AS
SELECT pod.ProductID,
SUM(pod.OrderQty) AS OrderQty,
SUM(pod.ReceivedQty) AS ReceivedQty,
SUM(pod.RejectedQty) AS RejectedQty,
COUNT_BIG(*) AS [Count]
FROM Purchasing.PurchaseOrderDetail AS pod
GROUP BY pod.ProductID ;
GO
CREATE UNIQUE CLUSTERED INDEX iv
ON Purchasing.IndexedView (ProductID) ;
GO