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表上創(chuàng)建聚集索引 create clustered index CLU_ABC on ABC(A) GO
--查看索引 sp_helpIndex ABC
--插入數(shù)據(jù) insert into ABC values(2,'B','C')
--因?yàn)橛芯奂饕哉麄€(gè)表的物理結(jié)構(gòu)發(fā)生了變化 --此時(shí)按照該索引查詢的內(nèi)容為: select * from ABC WITH(index = CLU_ABC) WHERE A>1 AND A5
--刪除索引后 Drop index ABC.CLU_ABC
--查詢內(nèi)容物理順序還是按照順序的 select * from ABC
--在ABC表上創(chuàng)建非聚集索引 create nonclustered index NONCLU_ABC on ABC(A)
--查看索引 sp_helpIndex abc
--插入數(shù)據(jù) insert into ABC values(4,'B','C')
--因?yàn)橛芯奂饕哉麄€(gè)表的物理結(jié)構(gòu)發(fā)生了變化 --此時(shí)查詢的內(nèi)容為: select * from ABC WITH(index = NONCLU_ABC)