SQL 多字段反旋转

Question

我有如下数据

CREATE TABLE #TEMP(OrderId int, Country varchar(100),Area varchar(100),Hotel varchar(100),CountryDetail varchar(100),AreaDetail varchar(100),HotelDetail varchar(100))

INSERT INTO #TEMP
VALUES(1,'Bhutan','Thimphu','Taj Tashi','Bhutan country info','Thimphu area info','Taj Tashi hotel info'),
      (2,'Bhutan','Punakha','COMO Uma Punakha','Bhutan country info','Punakha area info','COMO Uma Punakha hotel info'),
      (3,'Bhutan','Punakha','COMO Uma Paro','Bhutan country info','Punakha area info','COMO Uma Paro hotel info')

我想要的预期输出

Item                    ItemDetail                      OrderId
Bhutan                  Bhutan country info                 1 
Thimphu                 Thimphu area info                   1
Taj Tashi               Taj Tashi hotel info                1
Punakha                 Punakha area info                   2
COMO Uma Punakha        COMO Uma Punakha hotel info         2
COMO Uma Paro           COMO Uma Paro hotel info            3

输出是基于不重复国家、地区或酒店，按orderid只显示一次

目前已尝试

;WITH CTE AS (SELECT OrderId,Country,Area,Hotel,CountryDetail,AreaDetail,HotelDetail,            
              CountryDupe = ROW_NUMBER() OVER (PARTITION BY Country ORDER BY OrderId),
              AreaDupe = ROW_NUMBER() OVER (PARTITION BY Area ORDER BY OrderId),
               HotelDupe = ROW_NUMBER() OVER (PARTITION BY Hotel ORDER BY OrderId)
from #TEMP)

SELECT ITEM, OrderId
FROM (SELECT OrderId,CountryDetail,
                CASE WHEN CountryDupe=1 THEN Country ELSE '' END AS Country,
                CASE WHEN AreaDupe = 1 THEN Area ELSE '' END AS Area,
                CASE WHEN HotelDupe = 1 THEN Hotel ELSE '' END AS Hotel
     FROM CTE) P
UNPIVOT(
ITEM
FOR ITEMS IN (Country,Area,Hotel)
) UNPVT
WHERE LEN(ITEM)>1
ORDER BY OrderId

不确定如何在此处提取相关项目详细信息。

SQL FIDDLE here

Answer 1

您想对数据进行逆透视。我推荐 cross apply:

select t.orderid, v.item, v.itemdetail
from temp t cross apply
     (values (country, countrydetail),
             (hotel, hoteldetail)
     ) v(item, itemdetail);

Here 是一个 db<>fiddle.

Answer 2

这是一些奇怪的逻辑，但是，您可以使用 table 构造函数 VALUES 来逆透视数据，然后 ROW_NUMBER 仅 return "first"订单：

WITH RNs AS(
    SELECT V.Item,
           V.ItemDetail,
           T.OrderId,
           ROW_NUMBER() OVER (PARTITION BY V.Item, V.ItemDetail ORDER BY T.OrderId ASC) AS RN
    FROM #TEMP T
         CROSS APPLY (VALUES(T.Country, T.CountryDetail),
                            (T.Area, T.AreaDetail),
                            (T.Hotel, T.HotelDetail))V(Item, ItemDetail))
SELECT RNs.Item,
       RNs.ItemDetail,
       RNs.OrderId
FROM RNs
WHERE RN = 1
ORDER BY RNs.OrderId ASC;

SQL 多字段反旋转

SQL multiple field un-pivoting

sql

sql-server

pivot

unpivot

sql-server-2016