数据库 – VIEW与SQL语句的性能

select <field list> 
from <table list>
where <join conditions>
and <condition list>
and PrimaryKey in (select PrimaryKey from <table list>
    where <join list> 
    and <condition list>)
and PrimaryKey not in (select PrimaryKey from <table list>
    where <join list>
    and <condition list>)

子选择查询都有自己的多个子选择查询,我没有显示,以免混乱语句.

我团队的开发者之一认为一个观点会更好.我不同意,SQL语句使用程序传入的变量(基于用户的登录ID).

在使用视图时应该使用SQL语句吗？有什么样的性能增益问题是在自己的运行SQL语句与常规表相对于视图. (请注意,所有联接/条件与索引列相关,因此不应该是一个问题.)

编辑澄清…

这是我正在使用的查询：

select obj_id
from object
where obj_id in( 
(select distinct(sec_id) 
        from security 
        where sec_type_id = 494
        and (
            (sec_usergroup_id = 3278 
            and sec_usergroup_type_id = 230)
            or
            (sec_usergroup_id in (select ug_gi_id 
            from user_group 
            where ug_ui_id = 3278)
            and sec_usergroup_type_id = 231)
        )
        and sec_obj_id in (
        select obj_id from object 
        where obj_ot_id in (select of_ot_id 
            from obj_form 
            left outer join obj_type 
            on ot_id = of_ot_id 
            where ot_app_id = 87
            and of_id in (select sec_obj_id 
                from security
                where sec_type_id = 493
                and (
                    (sec_usergroup_id = 3278 
                    and sec_usergroup_type_id = 230)
                    or
                    (sec_usergroup_id in (select ug_gi_id 
                        from user_group 
                        where ug_ui_id = 3278)
                    and sec_usergroup_type_id = 231)
                    )                
            )   
            and of_usage_type_id  = 131
        )
        )   
        )
)
or 
(obj_ot_id in (select of_ot_id 
        from obj_form
        left outer join obj_type 
        on ot_id = of_ot_id 
        where ot_app_id = 87
        and of_id in (select sec_obj_id 
            from security
            where sec_type_id = 493
            and (
                (sec_usergroup_id = 3278 
                and sec_usergroup_type_id = 230)
                or
                (sec_usergroup_id in (select ug_gi_id 
                    from user_group 
                    where ug_ui_id = 3278)
                and sec_usergroup_type_id = 231)
                )
        )
        and of_usage_type_id  = 131

    )
    and
    obj_id not in (select sec_obj_id 
        from security 
        where sec_type_id = 494)
)

解决方法

视图是一种组织工具,而不是性能增强工具.

从SQL Server View resolution

When an SQL statement references a nonindexed view,the parser and query optimizer analyze the source of both the SQL statement and the view and then resolve them into a single execution plan. There is not one plan for the SQL statement and a separate plan for the view.

（编辑：李大同）

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