以下语句是我建立的一个视图,其中关联了4个表的数据。distinct后是18000多行数据。但是查询出来需要10以上的时间
请问我可以用什么办法来加快查询速度?貌似这种视图不能建立索引。报错:无法对视图 'v_detail' 创建 索引。它没有唯一聚集索引。因为视图是为了方便多个表联表查询是而设的,所以视图也是多个表中的字段由各个表中的关联关系二创建的一种虚拟表。
它不存在与实际的数据库存储空间中。因此不能创建索引SELECT DISTINCT
A.invname, A.invpinpai, A.invspec, REPLACE(A.invtype, ',', ' ') AS invtype, B.measname, A.pk_invcl, A.pk_corp, A.pk_invbasdoc, F.fullname,
E.cbuyer
FROM dbo.nw_inv AS A INNER JOIN
dbo.v_nw_measdoc AS B ON A.pk_measdoc = B.pk_measdoc INNER JOIN
dbo.v_nw_ic_onhandnum AS C ON C.cinvbasid = A.pk_invbasdoc AND C.pk_corp = A.pk_corp INNER JOIN
dbo.v_nw_stordoc AS D ON D.pk_stordoc = C.cwarehouseid AND C.pk_corp = D.pk_corp LEFT OUTER JOIN
dbo.v_nw_inv_position AS E ON E.pk_invbasdoc = A.pk_invbasdoc LEFT OUTER JOIN
dbo.sys_user AS F ON F.Nc_UserID = E.cemployeeid
请问我可以用什么办法来加快查询速度?貌似这种视图不能建立索引。报错:无法对视图 'v_detail' 创建 索引。它没有唯一聚集索引。因为视图是为了方便多个表联表查询是而设的,所以视图也是多个表中的字段由各个表中的关联关系二创建的一种虚拟表。
它不存在与实际的数据库存储空间中。因此不能创建索引SELECT DISTINCT
A.invname, A.invpinpai, A.invspec, REPLACE(A.invtype, ',', ' ') AS invtype, B.measname, A.pk_invcl, A.pk_corp, A.pk_invbasdoc, F.fullname,
E.cbuyer
FROM dbo.nw_inv AS A INNER JOIN
dbo.v_nw_measdoc AS B ON A.pk_measdoc = B.pk_measdoc INNER JOIN
dbo.v_nw_ic_onhandnum AS C ON C.cinvbasid = A.pk_invbasdoc AND C.pk_corp = A.pk_corp INNER JOIN
dbo.v_nw_stordoc AS D ON D.pk_stordoc = C.cwarehouseid AND C.pk_corp = D.pk_corp LEFT OUTER JOIN
dbo.v_nw_inv_position AS E ON E.pk_invbasdoc = A.pk_invbasdoc LEFT OUTER JOIN
dbo.sys_user AS F ON F.Nc_UserID = E.cemployeeid
create view 视图名 with schemabinding
as
select 语句
go---创建索引视图需要注意的几点
1. 创建索引视图的时候需要指定表所属的架构
--错误写法
create view v_f with schemabinding
as
select
a.a,a.b,b.a,b.b
from
a join b
on
a.id=b.id
go---正确写法:
create view v_f with schemabinding
as
select
a.a,a.b,b.a,b.b
from
dbo.a join dbo.b
on
a.id=b.id
go
2.在创建索引视图的select语句时,不使用*,必须指定具体的列名
--错误写法
create view v_f with schemabinding
as
select
*
from
dbo.a join dbo.b
on
a.id=b.id
go---正确写法
create view v_f with schemabinding
as
select
a.a,a.b,b.a,b.b
from
dbo.a join dbo.b
on
a.id=b.id
go3.在创建索引视图的select 语句中,不能存在重复的列名,这个不举例了4. 只能为索引视图创建唯一聚集索引
--正确的写法
create unique clustered index ix_uniquetb on v_tb
go--错误的写法
create clustered index ix_uniquetb on v_tb
go