Sql server 2008 更改单元格的值，然后连接成一行SQL Server 2008

所以我试图同时做几件事，但我不知道如何把它们组合起来

我的第一步是根据id将多个单元格合并成一行

USE MAIN;
Select ACT.ID AS Activity

,STUFF ((       Select ',' + LE.Name AS [text()]

               FROM ActivityDemographicEthnicity ADE
                LEFT OUTER JOIN LookupEthnicity LE
                ON LE.ID  = ADE.ethinicityId 

                WHERE ACT.ID = ADE.ActivityID

                FOR XML PATH ('')),1,1,'')

            AS Ethnicity

FROM Activity ACT

这很有效，并产生如下结果：

ID    Ethnicity
------------------------------------------
123   African, African American, Caucasian
125   Caucasian 
128   NULL

ID           Ethnicity
----------------------------------------
123          African American, Caucasian
125          Caucasian
128          General Market

但我想要这样的东西：

ID    Ethnicity
------------------------------------------
123   African, African American, Caucasian
125   Caucasian 
128   NULL

ID           Ethnicity
----------------------------------------
123          African American, Caucasian
125          Caucasian
128          General Market

我通过案例陈述定义了新值：

USE Main;
(Select CASE 
            When LE.Name is null THEN 'General Market'
            When LE.Name = 'African' THEN 'African American'
            When LE.Name = 'American Indian/Native American' Then 'American Indian'
            WHEN LE.NAME = 'Cambodian' Then 'Asian'
            When LE.Name = 'Chinese' Then 'Asian'
            When LE.Name = 'Filipino' Then 'Asian'
            When LE.Name = 'Hmong' Then 'Asian'
            WHEN LE.NAME = 'Japanese' THEN 'Asian'
            WHEN LE.Name = 'Korean' Then 'Asian'
            WHEN LE.Name = 'Laotian' Then 'Asian'
            WHEN LE.Name = 'Vietnamese' Then 'Asian'
            WHEN LE.Name = 'Armenian' Then 'Other'
            WHEN LE.Name = 'Russian' Then 'Other'
            WHEN LE.Name = 'Ukranian' Then 'Other'
            WHEN LE.Name = 'Other (specify)' Then 'Other'
            Else LE.Name
            End 'Ethnicity'

            From ActivityDemographicEthnicity ADE

            LEFT JOIN LookupEthnicity LE
                ON LE.ID = ADE.ID)`

---

两个查询都单独工作，但如何将它们组合成一个查询？

我假设您可以简单地将原始查询对

LE.Name

字段的调用替换为

CASE

语句，如下所示：

USE MAIN;
SELECT 
    ACT.ID AS Activity,
    STUFF 
      (
        (       
            SELECT ',' + 
                CASE 
                    When LE.Name is null THEN 'General Market'
                    When LE.Name = 'African' THEN 'African American'
                    When LE.Name = 'American Indian/Native American' Then 'American Indian'
                    WHEN LE.NAME = 'Cambodian' Then 'Asian'
                    When LE.Name = 'Chinese' Then 'Asian'
                    When LE.Name = 'Filipino' Then 'Asian'
                    When LE.Name = 'Hmong' Then 'Asian'
                    WHEN LE.NAME = 'Japanese' THEN 'Asian'
                    WHEN LE.Name = 'Korean' Then 'Asian'
                    WHEN LE.Name = 'Laotian' Then 'Asian'
                    WHEN LE.Name = 'Vietnamese' Then 'Asian'
                    WHEN LE.Name = 'Armenian' Then 'Other'
                    WHEN LE.Name = 'Russian' Then 'Other'
                    WHEN LE.Name = 'Ukranian' Then 'Other'
                    WHEN LE.Name = 'Other (specify)' Then 'Other'
                ELSE LE.Name
                END AS [text()]
            FROM 
                ActivityDemographicEthnicity ADE
                 LEFT OUTER JOIN 
                LookupEthnicity LE ON 
                    LE.ID  = ADE.ethinicityId 
            WHERE ACT.ID = ADE.ActivityID

            FOR XML PATH ('')
        ),1,1,''
      ) AS Ethnicity
FROM Activity ACT

这对你有用吗？

试一试：

Select ACT.ID AS Activity,
ISNULL(STUFF((Select distinct ',' + CASE 
                When LE.Name is null THEN 'General Market'
                When LE.Name = 'African' THEN 'African American'
                When LE.Name = 'American Indian/Native American' Then 'American Indian'
                WHEN LE.NAME = 'Cambodian' Then 'Asian'
                When LE.Name = 'Chinese' Then 'Asian'
                When LE.Name = 'Filipino' Then 'Asian'
                When LE.Name = 'Hmong' Then 'Asian'
                WHEN LE.NAME = 'Japanese' THEN 'Asian'
                WHEN LE.Name = 'Korean' Then 'Asian'
                WHEN LE.Name = 'Laotian' Then 'Asian'
                WHEN LE.Name = 'Vietnamese' Then 'Asian'
                WHEN LE.Name = 'Armenian' Then 'Other'
                WHEN LE.Name = 'Russian' Then 'Other'
                WHEN LE.Name = 'Ukranian' Then 'Other'
                WHEN LE.Name = 'Other (specify)' Then 'Other'
                ELSE LE.Name
                END  
               FROM ActivityDemographicEthnicity ADE
               LEFT OUTER JOIN LookupEthnicity LE ON LE.ID  = ADE.ethnicityId 
               WHERE ACT.ID = ADE.ActivityID
               FOR XML PATH ('')),1,1,''), 'General Market') AS Ethnicity
FROM Activity ACT

您需要将整个

STUFF

函数包装在

ISNULL

中，以捕获某个活动没有相应ActivityDemographics属性的情况。然后在

文件中选择distinct

，以删除重复文件

---

顺便说一句，谢谢你。它没有语法错误，但是它给出了“Asian，Asian，Latino”而不是“Asian，Latino”，并且它不考虑空值。很抱歉，没有意识到区分是一个要求。我不会更新我的原始答案，因为@Jerrad的评论做了适当的更改，他甚至使用了SQL FIDLE:）他的代码看起来很好。这非常有效。昨晚我睡着的时候，我突然想到了整件事，但我还没弄清楚到底是什么！我很感激你对所需的更改做出了解释！