查询以从 SQL 中的 XML 检索值

Question

我的 SQL 表中有以下 XML：

<SiteSurveyData>
  <SurveyQuestionAnswers>
    <QuestionGUID>61</QuestionGUID>
    <Answer>XXXXXXX</Answer>
  </SurveyQuestionAnswers>
  <SurveyQuestionAnswers>
    <QuestionGUID>62</QuestionGUID>
    <Answer>XXX</Answer>
  </SurveyQuestionAnswers>
  <SurveyQuestionAnswers>
    <QuestionGUID>64</QuestionGUID>
    <Answer>Both</Answer>
  </SurveyQuestionAnswers>
  <SurveyQuestionAnswers>
    <QuestionGUID>63</QuestionGUID>
    <Answer>aal5snap</Answer>
  </SurveyQuestionAnswers>
  <SurveyQuestionAnswers>
    <QuestionGUID>81</QuestionGUID>
    <Answer>00</Answer>
  </SurveyQuestionAnswers>

我想要查询的是 /Answer 中 /QuestionGUID = 61 和 62 的值。

我试过用这个：

value('(/SiteSurveyData/SurveyQuestionAnswers/QuestionGUID)[1]'

但它只返回第一个 QuestionGUID。
如何编写查询以返回 QuestionGUID 61 和 62 的答案？

或者我只想得到 QuestionGuid = 61 的 /Answer。
它并不总是第一个元素，是否可以编写查询使其返回 QuestionGuid=61 的值？

Answer 1

DECLARE @t TABLE(id INT IDENTITY(1,1),x XML);
INSERT INTO @t(x)VALUES('<SiteSurveyData>
  <SurveyQuestionAnswers>
    <QuestionGUID>61</QuestionGUID>
    <Answer>XXXXXXX</Answer>
  </SurveyQuestionAnswers>
  <SurveyQuestionAnswers>
    <QuestionGUID>62</QuestionGUID>
    <Answer>XXX</Answer>
  </SurveyQuestionAnswers>
  <SurveyQuestionAnswers>
    <QuestionGUID>64</QuestionGUID>
    <Answer>Both</Answer>
  </SurveyQuestionAnswers>
  <SurveyQuestionAnswers>
    <QuestionGUID>63</QuestionGUID>
    <Answer>aal5snap</Answer>
  </SurveyQuestionAnswers>
  <SurveyQuestionAnswers>
    <QuestionGUID>81</QuestionGUID>
    <Answer>00</Answer>
  </SurveyQuestionAnswers></SiteSurveyData>');

SELECT
    n.v.value('./QuestionGUID[1]','NVARCHAR(256)') AS QuestionGUID,
    n.v.value('./Answer[1]','NVARCHAR(256)') AS Answer
FROM
    @t AS t
    CROSS APPLY t.x.nodes('SiteSurveyData/SurveyQuestionAnswers[QuestionGUID="61" or QuestionGUID="62"]') AS n(v)

结果就是您想要的（两行以XXXXXXX 和XXX 作为答案）。这将应用一个 XPath 表达式来查找 SurveyQuestionAnswers 以及 61 或 62 的 QuestionGUID 子代。