按组获取SQL Server表的摘要

我有一个表，用户可以在其中设置对给定事件的反应/投票，我希望能够创建一个摘要视图，以查看哪种反应在大多数情况下被投票，除以每个事件的组

样本数据如下：

DECLARE @voteTable AS TABLE (
    id              INT IDENTITY(1,1) NOT NULL PRIMARY KEY CLUSTERED,
    eventId     VARCHAR(255) NOT NULL
,   isGroupA    INT NOT NULL
,   isGroupB    INT NOT NULL
,   userVote    VARCHAR(255) NOT NULL
);


INSERT INTO @voteTable (eventId, isGroupA, isGroupB, userVote)
VALUES
('event1','0','0','fantastic'),
('event1','0','0','fantastic'),
('event1','0','0','fantastic'),
('event1','0','0','fantastic'),
('event1','0','0','fantastic'),
('event1','0','0','fantastic'),
('event1','0','0','meh'),
('event1','0','0','meh'),
('event1','1','0','fine'),
('event1','1','0','fine'),
('event1','1','0','great'),
('event1','1','0','ok'),
('event1','1','0','ok'),
('event1','1','0','ok'),
('event1','0','1','fine'),
('event1','0','1','great'),
('event1','0','1','great'),
('event1','0','1','ok'),
('event1','1','1','bad'),
('event1','1','1','bad'),
('event1','1','1','horrible'),
('event1','1','1','horrible'),
('event1','1','1','horrible'),
('event1','1','1','horrible'),
('event1','1','1','horrible'),
('event1','1','1','ok'),
('event2','0','0','fantastic'),
('event2','0','0','fantastic'),
('event2','0','0','fantastic'),
('event2','0','0','horrible'),
('event2','0','0','fantastic'),
('event2','0','0','fantastic'),
('event2','0','0','fine'),
('event2','0','0','great'),
('event2','1','0','meh'),
('event2','1','0','meh'),
('event2','1','0','ok'),
('event2','1','0','ok'),
('event2','1','0','ok'),
('event2','1','0','ok'),
('event2','0','1','bad'),
('event2','0','1','bad'),
('event2','0','1','bad'),
('event2','0','1','bad'),
('event2','1','1','fine'),
('event2','1','1','fine'),
('event2','1','1','great'),
('event2','1','1','great'),
('event2','1','1','ok'),
('event2','1','1','bad'),
('event2','1','1','ok'),
('event2','1','1','ok')

我想要得到的输出应该是：

eventId |  groupA  |  groupB  | everyone
----------------------------------------
 event1 | horrible | horrible | fantastic
 event2 |    ok    |    bad   |    ok

原因是对于事件1：

• 那些对iGroupa投1票的人投了5次“糟糕”票，比任何人都多 其他投票类型
• 那些对isGroupB投1票的人也投了5次“糟糕”票，比其他人多 任何其他投票
• 无论是哪一组，event1的得票最多 “太棒了。”

与事件2类似：

• groupA中的人投了7次赞成票，比其他任何一票都多
• B组的人投了5次“不好”票，比其他任何一票都多
• 无论是哪一组，频率最高的投票类型为“ok”

我希望我清楚我的问题。如果我不清楚或者需要澄清什么，请告诉我

我曾考虑使用

计数（isGroupA）作为aVotes

，根据eventId和userVote进行分组，并使用

RANK（）

函数，但我似乎不知道如何构造整个查询

---

提前感谢您的帮助

您正在寻找模式。获取此信息的一种方法使用聚合和窗口函数：

select eventid,
       max(case when grp = 'A' then uservote end) as groupA,
       max(case when grp = 'B' then uservote end) as groupB,
       max(case when grp = 'Both' then uservote end) as both 
from (select eventid, uservote, grp, count(*) as cnt,
             row_number() over (partition by eventid, grp order by count(*) desc) as seqnum
      from votetable vt cross apply
           (values (case when isGroupA = '1' then 'A' end),
                   (case when isGroupB = '1' then 'b' end),
                   ('Both')
           ) v(grp)
      where grp is not null
      group by eventid, uservote, grp
     ) eg
where seqnum = 1
group by eventId;

是一个SQL FIDLE。

使用Cte表

;
with CteCount as(
Select eventId, isGroupA, null as isGroupB,
ROW_NUMBER() over (Partition by eventId, isGroupA, UserVote Order by eventId, isGroupA, UserVote) as isGroupACount,
null as isGroupBCount,
null as isAllCount,
uservote
from @voteTable
where isGroupA = 1

UNION ALL

Select eventId, null as isGroupA, isGroupB,
null,
ROW_NUMBER() over (Partition by eventId, isGroupB, UserVote Order by eventId, isGroupB, UserVote) as isGroupBCount,
null,
uservote
from @voteTable
where isGroupB = 1

UNION ALL

Select eventId, null as isGroupA, null as isGroupB, 
null,
null,
ROW_NUMBER() over (Partition by eventId, UserVote Order by eventId, UserVote) as isAllCount,
uservote
from @voteTable
),
CteSummary as(
Select eventId,
max(isGroupACount) as GroupA,
max(isGroupBCount) as GroupB,
max(isAllCount) as isAll
from CteCount
Group by eventId
)
Select
*,
(Select a.userVote from CteCount a where a.isGroupA = 1 and isGroupACount = GroupA and a.eventId = CteSummary.eventId) as GroupAvote,
(Select a.userVote from CteCount a where a.isGroupB = 1 and isGroupBCount = GroupB and a.eventId = CteSummary.eventId) as GroupBvote,
(Select a.userVote from CteCount a where a.isAllCount = isAll and a.eventId = CteSummary.eventId) as Allvote

from CteSummary 

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工作真的很好！只要在底部添加一个顶部（1），就可以在出现平局时进行选择=）