Question

您好我试图返回最常出现的值的记录。有了这个查询

SELECT b.section,c.valuename
      ,count(a.value) as counts

  FROM [dbo].[SurveyResponse] a
  JOIN [dbo].[Questions] b ON A.qid=b.qid
  join [dbo].[SurveyValues] c on a.value=c.value
  where profileid=2
  group by b.section,c.valuename
  order by 1,2

我得到了这些结果（Original Image）：

+ -- + ----------------------- + ----------------- + ------ +
|    | section                 | valuename         | counts |
+ -- + ----------------------- + ----------------- + ------ +
| 1  | Customer & Markets      | Completely Agree  | 2      |
| 2  | Customer & Markets      | Somewhat Agree    | 4      |
| 3  | Data and Analytics      | Completely Agree  | 3      |
| 4  | Data and Analytics      | Somewhat Disagree | 3      |
| 5  | Leadership & Culture    | Completely Agree  | 2      |
| 6  | Leadership & Culture    | Somewhat Agree    | 4      |
| 7  | Organization & Talent   | Completely Agree  | 3      |
| 8  | Organization & Talent   | Somewhat Agree    | 2      |
| 9  | Organization & Talent   | Somewhat Disagree | 1      |
| 10 | Products & Services     | Completely Agree  | 3      |
| 11 | Products & Services     | Somewhat Agree    | 1      |
| 12 | Products & Services     | Somewhat Disagree | 2      |
| 13 | Technology & Innovation | Completely Agree  | 3      |
| 14 | Technology & Innovation | Somewhat Agree    | 5      |
| 15 | Vision & Strategy       | Completely Agree  | 2      |
| 16 | Vision & Strategy       | Somewhat Agree    | 4      |
+ -- + ----------------------- + ----------------- + ------ +

从这个结果中，我想返回带有计数中值的节和值名称。例如，第7,9,9行，它应该返回第7行，值为3，因为它有更多的出现次数。

有人可以帮忙吗？

Answer 1

让我假设 - 基于该示例 - 您希望每个部分的计数最高。这是窗函数的简单应用：

select x.*
from (select q.section, c.valuename, count(sr.value) as counts,
             row_number() over (prtition by q.section order by count(sr.value) desc) as seqnum
      from [dbo].[SurveyResponse] sr join
           [dbo].[Questions] q
           on sr.qid = q.qid join
           [dbo].[SurveyValues] sv
           on sr.value = sv.value
      where profileid = 2
      group by q.section, c.valuename
     ) x
where seqnum = 1;

Answer 2

如果将查询放在CTE中，则可以使用相关子查询来获得所需的结果。

; with
    CTE as ( -- CTE
        SELECT    b.section
                , c.valuename
                , count(a.value) as counts
            FROM [dbo].[SurveyResponse] a
            JOIN [dbo].[Questions] b ON A.qid=b.qid
            join [dbo].[SurveyValues] c on a.value=c.value
            where profileid=2
            group by b.section,c.valuename
    )
select Section, ValueName, counts
    from CTE a
    where ValueName = ( -- Correlated Subquery
        select top 1 ValueName
            from CTE b
            where a.Section = b.Section
            order by counts desc
    )
    order by Section

仅返回最高价值记录

2 个答案: