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09.索引-过滤索引

USE IndexDB
GO                              
SELECT * INTO SalesOrderheader FROM AdventureWorks2008r2.Sales.SalesOrderheader
GO
--Unique Clustered index
CREATE UNIQUE CLUSTERED INDEX ix_SalesOrderheader ON SalesOrderheader(SalesOrderid)
GO
--Filtered Index
CREATE INDEX ix_filtered_index ON SalesOrderheader(orderdate) WHERE orderdate>‘2008-01-01‘
SELECT orderdate,SalesOrderid FROM SalesOrderheader WHERE
orderdate>‘2008-05-01‘
GO
SELECT orderdate,SalesOrderid FROM SalesOrderheader WHERE
orderdate=‘2008-03-01‘
GO
SELECT orderdate,SalesOrderid FROM SalesOrderheader WHERE
orderdate=‘2007-12-01‘
 
 
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参数化查询 可能会导致过滤索引失效

09.索引-过滤索引