sqlserver聚集索引和非聚集索引实例

来源：动视网责编：小采时间：2020-11-09 07:12:19

sqlserver聚集索引和非聚集索引实例

sqlserver聚集索引和非聚集索引实例:create database myIndexDemo go use myIndexDemo go create table ABC ( A int not null, B char(10), C varchar(10) ) go insert into ABC select 1,'B','C' union select 5,'B','C' union select 7,'B','C' union select 9,'B','C' go select * from ABC -

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导读sqlserver聚集索引和非聚集索引实例:create database myIndexDemo go use myIndexDemo go create table ABC ( A int not null, B char(10), C varchar(10) ) go insert into ABC select 1,'B','C' union select 5,'B','C' union select 7,'B','C' union select 9,'B','C' go select * from ABC -

create database myIndexDemo
go
use myIndexDemo
go
create table ABC
(
A int not null,
B char(10),
C varchar(10)
)
go
insert into ABC
select 1,'B','C'
union
select 5,'B','C'
union
select 7,'B','C'
union
select 9,'B','C'
go

select * from ABC

--在ABC表上创建聚集索引
create clustered index CLU_ABC
on ABC(A)
GO

--查看索引
sp_helpIndex ABC

--插入数据
insert into ABC
values(2,'B','C')

--因为有聚集索引所以整个表的物理结构发生了变化
--此时按照该索引查询的内容为:
select * from ABC WITH(index = CLU_ABC) WHERE A>1 AND A<5

--删除索引后
Drop index ABC.CLU_ABC

--查询内容物理顺序还是按照顺序的
select * from ABC

--在ABC表上创建非聚集索引
create nonclustered index NONCLU_ABC
on ABC(A)

--查看索引
sp_helpIndex abc

--插入数据
insert into ABC
values(4,'B','C')

--因为有聚集索引所以整个表的物理结构发生了变化
--此时查询的内容为:
select * from ABC WITH(index = NONCLU_ABC)

--删除索引后
Drop index ABC.NONCLU_ABC