構造化された XML データに加えて行データを選択する

レベルごとに 3 つの CROSS APPLY を連続して行うと、少し短くなる場合があります

 SELECT HistoryId, 
        t.qID,
        t.questionText,
        t.result,
        a.aId,
        a.answerNbr,
        a.answerChosen,
        a.answerTxt
    FROM
        tbl_QuizHistory
    CROSS APPLY QuizData.nodes('quizresult') AS n(q)    
    CROSS APPLY (
        SELECT 
          ROW_NUMBER() OVER (ORDER BY (SELECT NULL)) AS qID,
          t.q.value('(./questionText)[1]', 'nvarchar(max)') AS questionText,
          t.q.value('(./result)[1]', 'nvarchar(50)') AS result,
          t.q.query('.') queryXml
        FROM 
          n.q.nodes('./question') t(q)
    ) t
    CROSS APPLY (
        SELECT 
          ROW_NUMBER() OVER (ORDER BY (SELECT NULL)) AS aID,
          q.a.value('(./@number)[1]', 'int') as answerNbr,
          q.a.value('(./@chosen)[1]', 'bit') as answerChosen,
          q.a.value('.','nvarchar(max)') as answerTxt
        FROM
          t.queryXml.nodes('question/answer') q(a)
   ) a;

レベル固有の計算がない場合 (例:row_number() ) が必要です:

 SELECT HistoryId, 
        t.qID,
        t.questionText,
        t.result,
        q.a.value('(./@number)[1]', 'int') as answerNbr,
        q.a.value('(./@chosen)[1]', 'bit') as answerChosen,
        q.a.value('.','nvarchar(max)') as answerTxt
    FROM
        tbl_QuizHistory
    CROSS APPLY QuizData.nodes('quizresult') AS n(q)    
    CROSS APPLY (
        SELECT 
          ROW_NUMBER() OVER (ORDER BY (SELECT NULL)) AS qID,
          t.q.value('(./questionText)[1]', 'nvarchar(max)') AS questionText,
          t.q.value('(./result)[1]', 'nvarchar(50)') AS result,
          t.q.query('.') queryXml
        FROM n.q.nodes('./question') t(q)
    ) t
    CROSS APPLY t.queryXml.nodes('question/answer') q(a)

デモ