sql - 枢轴函数返回空值

Question

我想在第一行中显示所有三行，因此我在查询中使用了数据透视 **附上输出图片**

SELECT [Container Number],ReadTimee,Locationn,Trailer FROM             
(SELECT [Container Number],ReadTime,Location FROM #temp )as Tab1            
PIVOT            
(            
MAX(ReadTime) FOR Location IN (Trailer,ReadTimee,Locationn)) AS Tab2  

但是使用上面的查询返回 null .输出图片如下所示

我想要这样的输出

ReadTime                Location    Trailer Container Number           ReadTime                 Location    Trailer Container Number              ReadTime                  Location   Trailer  Container Number
2019-02-27 03:17:21.033 CUSTOM         1    ZIMU1374787,TRHU3437713   2019-02-27 06:10:35.470          ZERO        1    ZIMU1374787,TRHU3437713 2019-02-27 07:30:47.407             CFS            1    ZIMU1374787,TRHU3437713

Answer 1

试试这个:

SELECT Trailer, [Container Number], [CUSTOM] = MAX(CASE WHEN Location = 'CUSTOM' THEN ReadTime ELSE NULL END),
    [ZERO] = MAX(CASE WHEN Location = 'ZERO' THEN ReadTime ELSE NULL END),
    [CFS] = MAX(CASE WHEN Location = 'CFS' THEN ReadTime ELSE NULL END)
FROM @tmp 
GROUP BY Trailer, [Container Number]

以上查询返回:

Trailer Container Number        CUSTOM                  ZERO                    CFS
1       ZIMU1374787,TRHU3437713 2019-02-27 03:17:21.033 2019-02-27 06:10:35.470 2019-02-27 07:30:47.407