Question

我们有3张桌子。

tid_color - 参数化表

--------------------------
ID         ColorDescription
--------------------------
1          Green
2          Yellow
3          Red
-------------------------

tid_car - 参数化表

--------------------------
ID         CARDescription
-------------------------
1          Car X
2          Car Y
3          Car Z
--------------------------

table_owners_cars

------------------------------------------------
ID         CarID       ColorID      Owner
------------------------------------------------
1           1             1           John
2           1             2           Mary
3           1             3           Mary  
4           1             3           Giovanni     
5           2             2           Mary
6           3             1           Carl
7           1             1           Hawking
8           1             1           Fanny 
------------------------------------------------

CarID是tid_car的外键

ColorId是tid_color的外键

如果我们编码：

SELECT tcar.CarDescription, tco.ColorDescription, Count(*) as Total
FROM table_owners_cars tocar
LEFT JOIN tid_color tco ON tco.Id = tocar.ColorId
LEFT JOIN tid_Car tcar ON tcar.Id = tocar.CarId
GROUP BY CarDescription, ColorDescription

结果为：

Id CarDescription     ColorDescription  Total
1       CarX               Green          3
2       CarX               Yellow         1
3       CarX               Red            1
4       CarY               Yellow         1
5       CarZ               Green          1

但我想在HEADER中使用Color，所以我的代码为

SELECT CarId, [1] as 'Green', [2] as 'Yellow', [3] as 'Red', [1]+[2]+[3] as 'total' 
FROM
(SELECT CarID, colorId
 FROM table_owners_cars tocar
 LEFT JOIN tid_car tc  ON tocar.CarId=tc.Id) p 
PIVOT
( 
 COUNT (ColorId)
 FOR ColorId IN ( [1], [2], [3]) 
) AS pvt

带有此类SQL的结果表：

  ---------------------------------------------
   Id        Car     Green Yellow  Red    Total
   ---------------------------------------------
    1         1        3     1     1       5
    2         2        0     1     0       1                
    3         3        1     0     0       1                   
   ---------------------------------------------

它不能将汽车的描述（CarX，CarY，CarZ）放在Car列中......而不是我之前试过的代码中的第一个选择

SELECT tc.CarDescription, [1] as 'Green', [2] as 'Yellow', [3] as 'Red', [1]+[2]+[3] as 'total'

然后抛出

无法绑定多部分标识符“tc.CarDescription”。

我希望拥有 CarDescription ，而不是最后一个表中显示的ID。我希望有的表格如下。

我想完全按照以下方式进行转移：

   ---------------------------------------------
   Id        Car     Green Yellow  Red    Total
   ---------------------------------------------
    1       CarX        3     1     1       5
    2       CarY        0     1     0       1                
    3       CarZ        1     0     0       1                   
   ---------------------------------------------

如何实现这一目标？谢谢。

Answer 1

您可以加入Pivoted结果：

 SELECT pvt.CarID, tc.Description AS Car, [1] as 'Green', [2] as 'Yellow', [3] as 'Red', [1]+[2]+[3] as 'total' 
    FROM
    (SELECT CarID, colorId
     FROM table_owners_cars tocar
     ) p 
    PIVOT
    ( 
     COUNT (ColorId)
     FOR ColorId IN ( [1], [2], [3]) 
    ) AS pvt
    INNER JOIN tid_car tc  ON pvt.CarId=tc.Id

使用参数化旋转表格

1 个答案: