如何查詢4個透視表

Question

你能不能幫我如下檢查：

DECLARE @tblCity TABLE (CityID INT, CityName VARCHAR(100)) 
DECLARE @tblHotel TABLE (HotelID INT, HotelName VARCHAR(100)) 
DECLARE @tblTourClass TABLE (TourClassID INT, TourClass VARCHAR(100)) 
DECLARE @tblTourHotel TABLE (id INT, CityID INT, HotelID INT, TourClassID INT) 

INSERT INTO @tblCity SELECT 1, 'Phnom Penh' UNION SELECT 2, 'Siem Reap' UNION SELECT 3, 'Sihanouk Vill' 
INSERT INTO @tblHotel SELECT 1, 'City Angkor Hotel' UNION SELECT 2, 'Phnom Penh Hotel' UNION SELECT 3, 'Sihanouk Ville Hotel' UNION SELECT 4, 'New York Hotel' UNION SELECT 5, 'Pacific Hotel' UNION SELECT 6, 'Angkor Star Hotel' UNION SELECT 7, 'Khemera Angkor Hotel' UNION SELECT 8, 'Sokha beach Hotel' UNION SELECT 9, 'Costle Hotel' 
INSERT INTO @tblTourClass SELECT 1, 'Deluxe Class' UNION SELECT 2, 'Superior Class' UNION SELECT 3, 'Standard Class' 
INSERT INTO @tblTourHotel SELECT 1, 1, 2, 1 UNION SELECT 2, 2, 1, 1 UNION SELECT 3,3,3,1 UNION SELECT 4,1,4,2 UNION SELECT 5,1,5,3 UNION SELECT 6,2,6,2 UNION SELECT 7,2,7,3 UNION SELECT 8,3,8,2 UNION SELECT 9,3,9,3 

這裏的實際查詢：

SELECT CityName, [Deluxe Class], [Superior Class], [Standard Class] 
FROM 
(
SELECT tc.*, h.*, c.* 
FROM @tblTourClass tc 
    LEFT JOIN @tblTourHotel th ON tc.TourClassID = th.TourClassID 
    LEFT JOIN @tblCity c ON th.CityID = c.CityID 
    LEFT JOIN @tblHotel h ON th.HotelID = h.HotelID 
) AS sourcetable 
PIVOT 
( MAX(HotelName) 
    FOR TourClass IN ([Deluxe Class], [Superior Class], [Standard Class]) 
) AS pivottable 
WHERE CityName IS NOT NULL 

而且結果：

City Name  Deluxe Class   Superior First Standard 
Siem Reap  City Angkor Hotel  NULL NULL NULL 
Phnom Penh  Phnom Penh Hotel  NULL NULL NULL 
Sihanouk Vill Sihanouk Ville Hotel NULL NULL NULL 

但我想要顯示爲波紋管：

City Name Deluxe Class  Superior   Standard 
Siem Reap CityAngkor Hotel Angkor Star Hotel Khemera Angkor Hotel 
Phnom Penh Phnom Penh Hotel New York Hotel  Pacific Hotel 
Sihanouk Sihanouk Hotel Sokha beach Hotel Costle Hotel 

你能幫我做如何顯示如上。

千恩萬謝

Answer 1

試試這個：

SELECT 
    pvt.CityName, 
    pvt.[Deluxe Class], 
    pvt.[Superior Class], 
    pvt.[Standard Class] 
FROM ( 
SELECT 
    c 
    .CityName, 
    h.HotelName, 
    tc.TourClass 
FROM @tblCity c 
LEFT JOIN @tblTourHotel th ON c.CityID = th.CityID 
LEFT JOIN @tblHotel h ON th.HotelID = h.HotelID 
LEFT JOIN @tblTourClass tc ON th.TourClassID = tc.TourClassID 
) t 
PIVOT (
    MAX(HotelName) 
    FOR TourClass IN ([Deluxe Class], [Superior Class], [Standard Class]) 
) AS pvt 

它看起來像使用SELECT tc.*, h.*, c.*，總價值的計算就成了問題。但我也重新排列了查詢，以便@tblCity是所有左連接的基礎。