CREATE NONCLUSTERED INDEX FIBillOfMaterialsWithEndDate  
    ON Production.BillOfMaterials (ComponentID, StartDate)  
    WHERE EndDate IS NOT NULL ;  
GO  

筛选索引 FIBillOfMaterialsWithEndDate 对下面的查询有效。 您可以显示查询执行计划，以确定查询优化器是否使用了该筛选索引。

SQL复制

SELECT ProductAssemblyID, ComponentID, StartDate   
FROM Production.BillOfMaterials  
WHERE EndDate IS NOT NULL   
    AND ComponentID = 5   
    AND StartDate > '20080101' ;  

ProductAssemblyID字段没有包含在筛选索引里面,应该回表查询才对,但是执行计划并没有回表,非常迷惑.

ProductAssemblyID也并非主键

 改为SELECT　＊．．.

SELECT *
FROM Production.BillOfMaterials  
WHERE EndDate IS NOT NULL   
    AND ComponentID = 1
    AND StartDate > '20080101' ; 

标签：StartDate,Server,回表,索引,Production,BillOfMaterials,SQL,NULL,ComponentID
来源： https://blog.csdn.net/oWangJiaLong/article/details/120788843