SQL 计数或聚合错误

Question

这里是论坛的新手。我的问题是如何计算一列的数量并根据案例陈述呈现它？我搜索了论坛并找到了与获取计数、总和和聚合相关的答案，但没有找到与案例陈述的附加条件相关的任何问题。以下是我当前的代码。该代码可以正常工作，但无法按需要返回信息。

例如，假设在特定程序中的 5 个不同站点有 10 次访问。如何让输出显示为：

visits  e4pv.site_providing_service_name,   State   location    program_name
2   a   b   c   d
2   b   b   c   d
2   c   b   c   d
2   d   b   c   d
2   e   b   c   d

查询是：

select distinct
count (e4pv.people_id) as visits,--field is not numeric
e4pv.site_providing_service_name,
e4pv.actual_date,
CASE

when --case_out_locations_based_on_states

end as State,       
CASE
when rcis.program_name in ('')  
    then rcis.managing_office_name
when rcis.program_name not in ('')  
    then rcis.profile_name
end as location,rcis.program_name, e4pv.event_name
from dbo.rpt_events_4people_view as e4pv
join dbo.rpt_critical_info_script as rcis with (nolock) on
e4pv.people_id = rcis.people_id and
e4pv.site_providing_service = rcis.managing_office_id
left outer join dbo.program_modifier_enrollment_view as pmev with(nolock) on
    rcis.people_id = pmev.people_id 
where   
rcis.program_name not in ('')                           
and e4pv.event_name in ('')
and date between '07/01/2015' and '06/30/2016'
GROUP BY 
e4pv.people_id,
e4pv.site_providing_service_name,
e4pv.actual_date,
rcis.managing_office_name,
rcis.profile_name,
rcis.program_name

感谢您的帮助

更新的语法

我已经更新了语法，建议使用子查询并将 case 语句按部分添加到分组中，但仍然没有得到结果。该代码导致错误，例如组附近的语法不正确等。

select  visits,  State,  location, rcis.program_name, e4pv.event_name
 from (
 select distinct
count(e4pv.people_id) as visits,
e4pv.actual_date,
   CASE
   --cities mapped to states
    end as State,       
    CASE
 when rcis.program_name in ('') 
    then rcis.managing_office_name
 when rcis.program_name not in ('') 
    then rcis.profile_name
      end as location,
     rcis.program_name,
     e4pv.event_name

     from dbo.rpt_events_4people_view as e4pv

     join dbo.rpt_critical_info_script as rcis with (nolock) on
     e4pv.people_id = rcis.people_id and
     e4pv.site_providing_service = rcis.managing_office_id

     where  
   rcis.program_name not in ('')                            
   and e4pv.event_name in ('A')

       )

    GROUP BY 

     count(e4pv.people_id),
     rcis.profile_name,
     rcis.program_name,
      e4pv.event_name

Answer 1

我建议您在临时表中添加更多带有示例记录的信息。但是，此代码可以帮助您更清楚地构建您的想法以供其他人帮助您，或者您可以推断它以供您使用。 -- 假设：总部希望看到该人访问了与他相关的办公区域（西海岸或东海岸）的不同州

declare @table table (namee varchar(50),id int, stateeVisit varchar(5))
 insert @table select 'Gordin' ,1 , 'CA'
 insert @table select 'LingOff' ,2 , 'NY'
 insert @table select 'Ane' ,3 , 'CA'
 insert @table select 'Faheem' ,4 , 'PH'
 insert @table select 'George' ,5 , 'WA'
 --sample records added

; WITH CTE_AfterCase as (
 select 
    namee,
    id,
    stateeVisit,
    VisitToCoast = CASE WHEN stateeVisit in ('CA','WA') THEN 'WESTCOAST' ELSE         stateeVisit END 
 from @table ), 
 -- added conditional column in column table expression
 CTE_GroupedVisitCount as (
     select 
         A.VisitToCoast 
        ,A.stateeVisit as Statee
        ,count( A.id ) as visitcount

     from CTE_AfterCase A
     group by
       A.VisitToCoast 
        ,A.stateeVisit

        )  
-- grouped the required data
        select g.visitcount     ,rawdata.stateeVisit,rawdata.namee,rawdata.id,g.VisitToCoast  from     CTE_GroupedVisitCount g
        left join @table rawdata on g.statee = rawdata.stateeVisit
-- showed the grouping info with each record

希望对你有帮助

Answer 2

听起来您需要做的就是更改您的组中的内容。您需要按准确您希望在结果中看到的组进行分组，而不是按您用于创建它们的所有字段。因此，您要么必须将案例语句复制到组中，就像它们在选择中出现的那样（没有别名），或者您可以使用您所拥有的，选择 people_id 而不是计算它（并完全删除组） )，并将其包裹在一个重要的层中。这样，如果您需要更新您的案例陈述以了解位置，它只会在一个地方。

select count(people_id) visits, state, program_name [etc.]
from (your existing query with no count, and no group by ) x
group by state, program_name, [etc.]