構造化XMLデータに加えて行データを選択する

Question

XML変数を他のテーブルに結合する方法はわかっていますが、この場合はテーブルから各行を選択し、XMLの構造に加えて行がその行に沿って表示されます。ほとんどの例が単一のXML値を扱うので、私はこれを手助けするための例をオンラインで見つけることができません（もしあれば、私は無数の他のXML例の中でそれらを見つけることができませんでした）。

テーブル構造はこれです：

CREATE TABLE tbl_QuizHistory (
    HistoryId int PRIMARY KEY, 
    QuizData xml NOT NULL 
); 

各QuizData行の値はこれに類似している：earlier question I was shown how to display the XML data hierarchically（@xml ==> questions ==> answer(s)）において

<quizresult> 
    <question> 
    <questionText>Which fire extinguisher is most suitable for a waste paper basket fire?</questionText> 
    <answer number="0" value="0" chosen="0" imageURL="">Powder</answer> 
    <answer number="1" value="0" chosen="0" imageURL="">Carbon Dioxide (CO2)</answer> 
    <answer number="2" value="1" chosen="1" imageURL="">Water (H2O)</answer> 
    <answer number="3" value="0" chosen="0" imageURL="">Foam</answer> 
    <result>Correct</result> 
    </question> 
    <question> 
    <questionText>Should you use lifts during a fire?</questionText> 
    <answer number="0" value="0" chosen="0" imageURL="">Yes</answer> 
    <answer number="1" value="1" chosen="1" imageURL="">No</answer> 
    <result>Correct</result> 
    </question> 
</quizresult> 

、だけI単一のXML値について質問/回答階層をテーブルに移行するようになっている。

-- Works for a single XML value/variable... 
;WITH q AS (
    SELECT 
     ROW_NUMBER() OVER (ORDER BY (SELECT NULL)) AS qID, 
     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) 
), 
qa AS (
    SELECT 
     qID, 
     questionText, 
     result, 
     answer.query('.') AS answer 
    FROM 
     q CROSS APPLY 
     answers.nodes('answer') AS a(answer) 
) 
SELECT 
    qa.qID, 
    q.questionText, 
    q.result, 
    qa.answer.value('answer[1]', 'nvarchar(max)') AS answer, 
    qa.answer.value('answer[1]/@number', 'int') AS number, 
    qa.answer.value('answer[1]/@value', 'int') AS val, 
    qa.answer.value('answer[1]/@chosen', 'bit') AS chosen 
FROM 
    qa INNER JOIN 
    q ON qa.qID = q.qID; 

どのようにしてこのロジックを各XML行のすべてのテーブル行に適用できますか？私は（これは、SQL文によって生成されたが、明確にするための任意のIDで、そしてXMLには存在しない）クイズはそのクイズから

各質問をHistoryId

1. 表示する必要が
2. すべてを

   HistoryId qID questionText                   result  answer                     number val chosen 
   --------- ---- --------------------------------------------------------------------------------------- ---------- ---------------------------------------------------------------------------------------- ------- ---- ------ 
   100  1 Which fire extinguisher is most suitable for a waste paper basket fire?     Correct Powder                     0  0 0 
   100  1 Which fire extinguisher is most suitable for a waste paper basket fire?     Correct Carbon Dioxide (CO2)                  1  0 0 
   100  1 Which fire extinguisher is most suitable for a waste paper basket fire?     Correct Water (H2O)                    2  1 1 
   100  1 Which fire extinguisher is most suitable for a waste paper basket fire?     Correct Foam                      3  0 0 
   100  2 What should your immediate action be on hearing a fire alarm?       Correct Find all of your colleagues before making a speedy exit together       0  0 0 
   100  2 What should your immediate action be on hearing a fire alarm?       Correct Collect all your valuables before making a speedy exit         1  0 0 
   100  2 What should your immediate action be on hearing a fire alarm?       Correct Check the weather to see if you need your coat before leaving       2  0 0 
   100  2 What should your immediate action be on hearing a fire alarm?       Correct Leave the building by the nearest exit, closing doors behind you if the rooms are empty 3  1 1 
   101  1 Which fire extinguisher is most suitable for a waste paper basket fire?     Correct Powder                     0  0 0 
   101  1 Which fire extinguisher is most suitable for a waste paper basket fire?     Correct Carbon Dioxide (CO2)                  1  0 0 
   101  1 Which fire extinguisher is most suitable for a waste paper basket fire?     Correct Water (H2O)                    2  1 1 
   101  1 Which fire extinguisher is most suitable for a waste paper basket fire?     Correct Foam                      3  0 0 
   101  2 Should you use lifts during a fire?              Correct Yes                      0  0 0 
   101  2 Should you use lifts during a fire?              Correct No                      1  1 1 
   101  3 Which part of a Carbon Dioxide (CO2) extinguisher should you not touch when operating? Incorrect The body of the extinguisher                0  0 1 
   101  3 Which part of a Carbon Dioxide (CO2) extinguisher should you not touch when operating? Incorrect The release trigger and the bottom of the extinguisher         1  0 0 
   101  3 Which part of a Carbon Dioxide (CO2) extinguisher should you not touch when operating? Incorrect The horn of the extinguisher                2  1 0 
   

   ：各質問

のための答えは私が達成しようとしている最終的な結果は次のようなものを生成します

これは多数の重複を作成することに感謝しています（質問は各回答ごとに繰り返されます）が、大丈夫です。

私はを持っており、サンプルデータが設定されています。

Answer 1

何のレベル特定の計算（例えばrow_number()）が必要でない場合、それは、3 CROSS APPLY一連のレベル

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; 

によってレベルビット短くすることができる。

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) 

Demo

Answer 2

私が正しくあなたを理解していれば、あなたがしたい：

;WITH q AS (
    SELECT 
     ROW_NUMBER() OVER (ORDER BY (SELECT NULL)) AS qID, 
     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 tbl_QuizHistory t 
    CROSS APPLY t.QuizData.nodes('/quizresult/question') AS n (q) 
), 
qa AS (
    SELECT 
     qID, 
     questionText, 
     result, 
     answer.query('.') AS answer 
    FROM q 
    CROSS APPLY answers.nodes('answer') AS a(answer) 
) 
SELECT 
    qa.qID, 
    q.questionText, 
    q.result, 
    qa.answer.value('answer[1]', 'nvarchar(max)') AS answer, 
    qa.answer.value('answer[1]/@number', 'int') AS number, 
    qa.answer.value('answer[1]/@value', 'int') AS val, 
    qa.answer.value('answer[1]/@chosen', 'bit') AS chosen 
FROM qa 
JOIN q ON qa.qID = q.qID; 

Rextester Demo

---

あるいは短い：

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

Rextester Demo 2

EDIT：

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

Answer 3

私はそれを達成するための最も直接的な方法は、テーブル値関数に与えられた変数のために働くあなたのコードをラップすることだと思います。同じ結果をクエリのインライン展開で実現できますが、あなたのような複雑なコードでは、関数を使用すると読みやすくなります。パフォーマンスは、複数のステートメント関数ではなく、 "インライン"のテーブル値関数なので、同じままです。

When would you use a table-valued function?

機能

CREATE FUNCTION [dbo].[GetQuizData] 
(
    @ParamQuizData xml 
) 
RETURNS TABLE 
AS 
RETURN 
(
    WITH q AS 
    (
    SELECT 
     ROW_NUMBER() OVER (ORDER BY (SELECT NULL)) AS qID, 
     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 
     @ParamQuizData.nodes('/quizresult/question') AS n (q) 
    ), 
    qa AS 
    (
     SELECT 
      qID, 
      questionText, 
      result, 
      answer.query('.') AS answer 
     FROM 
      q CROSS APPLY 
      answers.nodes('answer') AS a(answer) 
    ) 
    SELECT 
     qa.qID, 
     q.questionText, 
     q.result, 
     qa.answer.value('answer[1]', 'nvarchar(max)') AS answer, 
     qa.answer.value('answer[1]/@number', 'int') AS number, 
     qa.answer.value('answer[1]/@value', 'int') AS val, 
     qa.answer.value('answer[1]/@chosen', 'bit') AS chosen 
    FROM 
     qa INNER JOIN 
     q ON qa.qID = q.qID 
) 

メインクエリ

SELECT 
    tbl_QuizHistory.HistoryID 
    ,Q.* 
FROM 
    tbl_QuizHistory 
    CROSS APPLY [dbo].[GetQuizData](tbl_QuizHistory.QuizData) AS Q 
; 

SQL Fiddle

を参照してください、例えば参照してください。

免責事項：正確性に関する質問からコードを分析しませんでした。私はそれをあなたが働くために必要なときに機能すると仮定して、関数に単純にラップしました。

---

TVFから長いクエリを手動でCROSS APPLYにインライン化できます。 CTEもインライン化する必要があり、見た目が醜いでしょう。このバリアントとバリアントの実行計画をTVFと比較することができます。彼らは同じでなければなりません。

ここにはSQL Fiddleです。

インラインクエリ

SELECT 
    tbl_QuizHistory.HistoryID 
    ,CA.* 
FROM 
    tbl_QuizHistory 
    CROSS APPLY 
    (
     SELECT 
      qa.qID, 
      q.questionText, 
      q.result, 
      qa.answer.value('answer[1]', 'nvarchar(max)') AS answer, 
      qa.answer.value('answer[1]/@number', 'int') AS number, 
      qa.answer.value('answer[1]/@value', 'int') AS val, 
      qa.answer.value('answer[1]/@chosen', 'bit') AS chosen 
     FROM 
      (
       SELECT 
        qID, 
        questionText, 
        result, 
        answer.query('.') AS answer 
       FROM 
        (
         SELECT 
          ROW_NUMBER() OVER (ORDER BY (SELECT NULL)) AS qID, 
          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 
          tbl_QuizHistory.QuizData.nodes('/quizresult/question') AS n (q) 
        ) AS q0 
        CROSS APPLY 
        answers.nodes('answer') AS a(answer) 
      ) AS qa 
      INNER JOIN 
      (
       SELECT 
        ROW_NUMBER() OVER (ORDER BY (SELECT NULL)) AS qID, 
        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 
        tbl_QuizHistory.QuizData.nodes('/quizresult/question') AS n (q) 
      ) AS q 
      ON qa.qID = q.qID 
    ) AS CA 
; 

この長いクエリを簡素化することができるが、私はそれが何をするかを分析していないと、それはそれをしませんか。私は単に与えられた作業照会をインライン化しました。