调查结果的 SQL 问题

Question

您好，我有一个查询返回此

member_id   question_variable                                  response_id label
----------- -------------------------------------------------- ----------- ----------------------------
35          area                                               15          Sydney (Metro)
35          relationship_status                                8           Single
35          education                                          31          Bachelor Degree
35          house_hold_income                                  4           $75,001 to $100,000
35          pets                                               36          Dog
35          pets                                               37          Fish

如何检测重复的结果，例如宠物，response_id = 36,37 且标签 = Dog、Fish像这样

member_id   question_variable                                  response_id label
----------- -------------------------------------------------- ----------- ----------------------------
35          area                                               15          Sydney (Metro)
35          relationship_status                                8           Single
35          education                                          31          Bachelor Degree
35          house_hold_income                                  4           $75,001 to $100,000
35          pets                                               36,37          Dog,Fish

Answer 1

您必须使用关键字STUFF才能获得上述结果。

查询:

SELECT DISTINCT T1.MEMBER_ID,T1.QUESTION_VARIABLE,
  STUFF((SELECT DISTINCT ',' + T2.RESPONSE_ID
         FROM TEST T2
         WHERE T1.QUESTION_VARIABLE = T2.QUESTION_VARIABLE
            FOR XML PATH('') ),1,1,'') AS RESPONSE_ID,
  STUFF((SELECT DISTINCT ',' + T2.LABEL
         FROM TEST T2
         WHERE T1.QUESTION_VARIABLE = T2.QUESTION_VARIABLE
            FOR XML PATH('') ),1,1,'') AS LABEL         

FROM TEST T1
;

HERE IS THE LINK TO SQL FIDDLE http://sqlfiddle.com/#!3/64515/3