需要在不添加索引

Question

我有一个与索引和执行计划相关的查询。以下是我正在使用的几张表

表1：TestReviewResult

Column_name | Type | Length

TestReviewResultId | int | 4

TestNumber | int | 4

ReviewerUserId | int | 4

当前指数

index_name index_description index_keys

TestReviewResult_PK位于PRIMARY上的集群唯一主键TestReviewResultId

表2：TestReviewFinding

Column_name类型长度

TestReviewFindingId int 4

TestReviewResultId int 4

ScreenCode varchar 100

ReviewComments varchar 8000

CURRENTINDEX

index_name index_description index_keys

TestReviewFinding_PK位于PRIMARY TestReviewFindingId上的集群唯一主键

表3：TestReviewResultComment

Column_name类型长度

TestReviewResultCommentId Int 4

TestReviewResultId Int 4

TestReviewComment varchar 8000

CURRENTINDEX

index_name index_description index_keys

TestReviewResultComment_CI集群位于PRIMARY TestReviewResultId

TestReviewResultComment_PK位于PRIMARY上的非聚集，唯一主键TestReviewResultCommentId

表4：TestReviewFindingElement

Column_name类型长度

TestReviewFindingElementId Int 4

TestReviewFindingId Int 4

ElementCode varchar 25

CURRENTINDEX

index_name index_description index_keys

TestReviewFindingElementType_PK位于PRIMARY上的集群唯一主键TestReviewFindingElementId

以下是正在使用的查询

Select columnnames…. from 
From TestReviewResult(NOLOCK) cr 
left outer join TestReviewResultComment(NOLOCK) crc

 on cr.TestReviewResultId = crc.TestReviewResultId

 left outer join TestReviewFinding(NOLOCK) cf

 on cf.TestReviewResultId = cr.TestReviewResultId

 left outer join TestReviewFindingElement(NOLOCK) crf

on cf.TestReviewFindingId = crf.TestReviewFindingId

 where cr.TestReviewResultId = @TestReviewNumber  -- Test Review number is 
 being passed in the stored procedure

当我运行执行计划时，它建议添加下面提到的2个索引

CREATE NONCLUSTERED INDEX IX_TestReviewResultId
ON [TestReviewFinding] (TestReviewResultId)

 CREATE NONCLUSTERED INDEX IX_TestReviewFindingId
 ON [TestReviewFindingElement] (TestReviewFindingId)

有没有其他方法可以在不添加索引的情况下调整上述查询，因为有很多写操作可以执行

下面是您可以在SQL Server中执行的ddl，并检查查询执行计划

Create table TestReviewResult(
TestReviewResultId        int            NOT NULL PRIMARY KEY ,
TestNumber      int          ,
ReviewerUserId              int          )


insert into TestReviewResult values(1,1,1)
insert into TestReviewResult values(2,2,2)
insert into TestReviewResult values(3,3,3)






    Create table TestReviewFinding(
    TestReviewFindingId      int          not null primary key,
TestReviewResultId        int          ,
ScreenCode       varchar(100))

insert into TestReviewFinding values(1,1,'A')
insert into TestReviewFinding values(2,2,'B')
insert into TestReviewFinding values(3,3,'C')




Create table TestReviewResultComment(
TestReviewResultCommentId    int not null primary key     nonclustered,
TestReviewResultId    int    ,
TestReviewComment     varchar(      8000)

)

CREATE CLUSTERED INDEX [CI_TestReviewResultId]   
    ON TestReviewResultComment (TestReviewResultId); 

insert into TestReviewResultComment values(1,1,'A')
insert into TestReviewResultComment values(2,2,'B')

insert into TestReviewResultComment values(3,3,'C')






Create table TestReviewFindingElement(
TestReviewFindingElementId   int    not null primary key,
TestReviewFindingId   int    ,
ElementCode   varchar(25))


insert into TestReviewFindingElement values(1,1,'A')
insert into TestReviewFindingElement values(2,3,'B')
insert into TestReviewFindingElement values(3,3,'C')

当我运行以下查询时，我在2个表上获得索引扫描 TestReviewFindingElement和TestReviewFinding

Select *
From TestReviewResult(NOLOCK) cr 
left outer join TestReviewResultComment(NOLOCK) crc

 on cr.TestReviewResultId = crc.TestReviewResultId

  left outer join TestReviewFinding(NOLOCK) cf

  on cf.TestReviewResultId = cr.TestReviewResultId

  left outer join TestReviewFindingElement(NOLOCK) crf

 on cf.TestReviewFindingId = crf.TestReviewFindingId
 where cr.TestReviewResultId = @TestReviewNumber  -- Test Review number is 
  being passed in the stored procedure.You can use --> 1

有没有办法修改select查询以避免扫描而不添加索引