Question

我的问题似乎非常简单，但我正在努力掌握一种更简单的方法来实现所需的输出。

问题：我在表格中有条目。这些条目由ID列标识。他们与一张表格相结合，该表格显示了他们持有或持有的特定志愿者职位。如果它们被识别为具有多个位置，则它们的记录会多次返回。

解决方案：我想在一列中列出他们的位置，以便他们基于ID列的输入只返回一次。我尝试过使用STUFF和CONCAT，但它们返回的是每个条目保持的相同位置的倍数，而不是查明它们是否有多个位置并列出它们，这意味着我可能错误地使用了这些函数。

这是当前的输出：

ID         FIRST_NAME           current_flag Position
---------- -------------------- ------------ ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
106379     Christine            1            NOMAL
106379     Christine            1            SFC
106418     Mary                 1            CVP
106751     Denise               1            SDFA
106885     Marianna             1            RCRA
107244     Jennifer             1            RCF

这是所需的输出：

 ID         FIRST_NAME           current_flag Position
---------- -------------------- ------------ ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
106379     Christine            1            NOMAL,SFC
106418     Mary                 1            CVP
106751     Denise               1            SDFA
106885     Marianna             1            RCRA
107244     Jennifer             1            RCF

我删除了无关的列，因为输出不利于显示所需的输出，但它们包含在我的代码中，如下所示。现行守则：

SELECT DISTINCT Name.ID, 
                Name.FIRST_NAME, 
                Name.LAST_NAME, 
                Name_Address.ADDRESS_1, 
                Name_Address.CITY, 
                Name_Address.STATE_PROVINCE, 
                Name_Address.ZIP, 
                Name_Address.PREFERRED_MAIL,      
                vcsiboCurrentCommittee.current_flag, 
                CONVERT(VARCHAR(10), Name.BIRTH_DATE, 101) AS BirthDate,
                vcsiboCurrentCommittee.Position
FROM         Name INNER JOIN
             Name_Address ON Name.ID = Name_Address.ID INNER JOIN
             vcsiboCurrentCommittee ON Name.ID = vcsiboCurrentCommittee.ID
WHERE     (Name_Address.PREFERRED_MAIL = 1.00) 
          AND (vcsiboCurrentCommittee.current_flag = 1.00) 
          AND (Name.ID <> 10) AND (Name.BIRTH_DATE <> '') 
          AND (vcsiboCurrentCommittee.CommitteeCode IN 
         ('ALUMNAE_DEPT', 'COLLEGIATE-DEPT', 'EDUCATION', 'FINANCIAL', 'INTERN_COUNCIL', 'IPDEPT', 'MEMBERSHIP','PANHELLENIC', 'REG_1', 'REG_2', 'REG_3', 'REG_4', 'REG_5', 'REG_6', 'REG_7', 'REG_8'))

使用STUFF的代码：

SELECT DISTINCT Name.ID, 
                Name.FIRST_NAME, 
                Name.LAST_NAME, 
                Name_Address.ADDRESS_1, 
                Name_Address.CITY, 
                Name_Address.STATE_PROVINCE, 
                Name_Address.ZIP,                            
                Name_Address.PREFERRED_MAIL,
                vcsiboCurrentCommittee.current_flag,
                CONVERT(VARCHAR(10), Name.BIRTH_DATE, 101) AS BirthDate,
                STUFF(
                (SELECT
                CAST(',' AS varchar(max)) + vcsiboCurrentCommittee.Position
                FROM vcsiboCurrentCommittee AS vcc
                WHERE vcc.ID = Name.ID
                ORDER BY vcc.Position
                FOR xml path('')
                ), 1, 1, '') AS Positions,
            vcsiboCurrentCommittee.Position
FROM Name INNER JOIN
     Name_Address ON Name.ID = Name_Address.ID INNER JOIN
     vcsiboCurrentCommittee ON Name.ID = vcsiboCurrentCommittee.ID
WHERE (Name_Address.PREFERRED_MAIL = 1.00) AND   
      (vcsiboCurrentCommittee.current_flag = 1.00) 
      AND (Name.ID <> 10) AND (Name.BIRTH_DATE <> '') 
      AND (vcsiboCurrentCommittee.CommitteeCode IN ('ALUMNAE_DEPT', 'COLLEGIATE-DEPT', 'EDUCATION', 'FINANCIAL', 'INTERN_COUNCIL', 'IPDEPT', 'MEMBERSHIP', 'PANHELLENIC', 'REG_1', 'REG_2', 'REG_3', 'REG_4', 'REG_5', 'REG_6', 'REG_7', 'REG_8'))

创造了这个输出：

ID         FIRST_NAME           current_flag Positions                                                                                                                                                                                                                                                        Position
---------- -------------------- ------------ ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
106379     Christine            1            NOMAL,NOMAL,NOMAL,NOMAL,NOMAL,NOMAL,NOMAL,NOMAL,NOMAL,NOMAL                                                                                                                                                                                                      NOMAL
106379     Christine            1            SFC,SFC,SFC,SFC,SFC,SFC,SFC,SFC,SFC,SFC                                                                                                                                                                                                                          SFC
106418     Mary                 1            CVP,CVP,CVP,CVP,CVP,CVP,CVP,CVP,CVP,CVP,CVP,CVP,CVP                                                                                                                                                                                                              CVP
106751     Denise               1            SDFA,SDFA,SDFA,SDFA,SDFA,SDFA,SDFA,SDFA,SDFA,SDFA,SDFA

提前致谢。 SQL Server 2012

Answer 1

我认为您需要修复子查询中的别名，并且可能需要select distinct：

STUFF((SELECT DISTINCT CAST(',' AS varchar(max)) + vcc.Position
---------------------------------------------------^
        FROM vcsiboCurrentCommittee AS vcc
        WHERE vcc.ID = Name.ID
        ORDER BY vcc.Position
        FOR xml path('')
       ), 1, 1, '') AS Positions,

修复别名后（因此Position引用内部表而不是外部表），可能不需要DISTINCT。如果您使用DISTINCT，则可能还需要调整ORDER BY。

编辑：

外部查询中的重复项由外部查询中的逻辑创建。您可能不希望在子查询中使用相同的表。要说出你真正想要的逻辑是很难的。在将vcsiboCurrentCommittee加入其他表之前，可能会对def update @newevent = Event.find(params[:id]) if @newevent.update_attributes(params[:newevent]) redirect_to @user else render action: "edit" end end进行某种聚合。

将多列位置作为列表返回一行

1 个答案: