如何使PIVOT成爲表格/交叉表格查詢？

Question

我已經做了SELECT語句來得到這個輸出：

MOVIE       Critic Type Average Rating 
------------------------  ------------ -------------- 
30 Minutes or Less    Critic     2.00 
30 Minutes or Less    User     4.20 
A Lonely Place to Die   Critic    10.00 
A Lonely Place to Die   User     8.50 
Taken       Critic     6.17 
Taken       User     7.27 
Taken 2       Critic     4.00 
Taken 2       User     6.29 

8 rows selected 

這裏是SELECT聲明：

SELECT MovieTitle AS "MOVIE", TBLCRITICCLASS.CRITICCLASSDESC AS "Critic Type", AVG(TBLREVIEW.REVIEWSTAR) AS "Average Rating" 
FROM TBLMOVIE 
INNER JOIN TBLREVIEW ON TBLMOVIE.MOVIEID = TBLREVIEW.MOVIEID 
INNER JOIN TBLCRITIC ON TBLREVIEW.CRITICID = TBLCRITIC.CRITICID 
INNER JOIN TBLCRITICCLASS ON TBLCRITIC.CRITICCLASSID = TBLCRITICCLASS.CRITICCLASSID 
GROUP BY MovieTitle, TBLCRITICCLASS.CRITICCLASSDESC 
ORDER BY Movietitle; 

我想打開這個表到這個輸出與PIVOT獲得與輸出批評評級和用戶評級，因爲它是自己的類別：

MOVIE       Critic Rating User Rating 
------------------------  ------------- ----------- 
30 Minutes or Less    2.00     4.20 
A Lonely Place to Die   10.00     8.50 
Taken       6.17     7.27 
Taken 2       4.00     6.29 

我試圖做是：

SELECT * FROM 
(
    SELECT MovieTitle AS "MOVIE", AVG(TBLREVIEW.REVIEWSTAR) AS "Critic Rating", AVG(TBLREVIEW.REVIEWSTAR) AS "User Rating" 
    FROM TBLMOVIE 
    INNER JOIN TBLREVIEW ON TBLMOVIE.MOVIEID = TBLREVIEW.MOVIEID 
    INNER JOIN TBLCRITIC ON TBLREVIEW.CRITICID = TBLCRITIC.CRITICID 
    INNER JOIN TBLCRITICCLASS ON TBLCRITIC.CRITICCLASSID = TBLCRITICCLASS.CRITICCLASSID 
    GROUP BY MovieTitle, TBLCRITICCLASS.CRITICCLASSDESC 
    ORDER BY Movietitle 
) 

PIVOT 
(
    AVG(TBLREVIEW.REVIEWSTAR) AS "Critic Rating" 
    FOR TBLREVIEW.REVIEWSTAR IN (TBLCRITICCLASS.CRITICCLASSDESC) 

    AVG(TBLREVIEW.REVIEWSTAR) AS "User Rating" 
    FOR TBLREVIEW.REVIEWSTAR IN (TBLCRITICCLASS.CRITICCLASSDESC) 
) 

我得到的錯誤，這可能是由於我缺乏與子查詢的技巧，我想知道爲什麼我沒有得到我的首選輸出，以及如何解決它。

編輯：

下面是相關聯的表：

File1 (Pastebin)

File2 (Pastebin)

Answer 1

請讓你的支點說法是錯誤的。你可以用你的查詢替換下面的CTE，它應該可以工作。

SELECT * 
FROM (SELECT MovieTitle AS "MOVIE" 
      , TBLCRITICCLASS.CRITICCLASSDESC AS  "Critic Type" 
      , AVG(TBLREVIEW.REVIEWSTAR) AS "Average Rating" 
     FROM TBLMOVIE 
     INNER JOIN TBLREVIEW 
     ON TBLMOVIE.MOVIEID = TBLREVIEW.MOVIEID 
     INNER JOIN TBLCRITIC 
     ON TBLREVIEW.CRITICID = TBLCRITIC.CRITICID 
     INNER JOIN TBLCRITICCLASS 
     ON TBLCRITIC.CRITICCLASSID = TBLCRITICCLASS.CRITICCLASSID 
     GROUP BY MovieTitle, TBLCRITICCLASS.CRITICCLASSDESC 
    ) 
PIVOT (AVG("Average Rating") for "Critic Type" 
    in ('Critic' as "Critic Rating", 'User' as "User Rating"))) 
ORDER BY Movie 

至於「爲什麼我沒有得到我的首選輸出」

您piviting的「批判型」的，你有兩個值（「評論家」和用戶「）將彙集起來avg品牌感;但在你的例子中，每個記錄只有1個值，所以最小/最大值也可以。

在數據透視表中，您可以指定數據透視表的「in」部分中的每個列，讓數據庫引擎根據「Critic Type」列中的值確定如何處理數據。

因爲您必須指定每個值，所以不能有動態範圍，沒有動態SQL。

注意：如果您希望使用與「for」透視字段中的值不同的名稱，則可以在透視的「IN」部分中對列進行別名。