Possiamo (ab)usare ROW_NUMBER() per generare gli ID al di fuori di XQuery. Preambolo:
WITH questions AS (
SELECT
ROW_NUMBER() OVER (ORDER BY (SELECT NULL)) AS ID,
n.q.value('(./questionText)[1]', 'nvarchar(max)') AS questionText,
n.q.value('(./result)[1]', 'nvarchar(50)') AS result,
n.q.query('answer') AS answers
FROM
@xml.nodes('/quizresult/question') AS n (q)
), questions_and_answers AS (
SELECT ID, questionText, result, answer.query('.') AS answer
FROM questions
CROSS APPLY answers.nodes('answer') AS a(answer)
)
E ora recupera le domande con
SELECT ID, questionText, result
FROM questions
E le risposte con
SELECT ID AS questionID,
q.answer.value('answer[1]', 'nvarchar(max)') AS answer,
q.answer.value('answer[1]/@number', 'int') AS number,
q.answer.value('answer[1]/@value', 'int') AS val,
q.answer.value('answer[1]/@chosen', 'bit') AS chosen
FROM questions_and_answers AS q
