Question

我有一些原始数据

现在我想写一些DAX，以便可以进行以下操作：

如您所见，我在那里能够得到一个约会。这是我使用的DAX：

Last MT 1 Date = 
CALCULATE (
    VALUES ( Main_Tanks_Last[Last Date].[Date] ),
    FILTER ( Main_Tanks_LAST, [Main Tank 1 ID] = VALUES( Main_Tanks[Tank ID] ) )
)

那么，我怎样才能得到一个列，以便它查看坦克以确定其ID，并将其与主坦克1 ID，主坦克2 ID或主坦克3 ID进行比较并填写日期？而且，如果没有坦克1 2或3，它也不会引发错误。

数据是从SQL Server 2014导入的。

添加的信息

因此原始数据来自此SQL查询：

DECLARE @MT1_ID AS INT, @MT2_ID AS INT, @MT3_ID AS INT

SELECT DISTINCT
    IBX_Name AS "IBX",
    (SELECT ([Tank_ID]) FROM Tanks WHERE Tanks.fk_IBX_ID = IBXs.IBX_ID AND Tanks.Main_Tank_Index = 1) AS "Main Tank 1 ID",
    AST_UST_Level1 AS "Latest Main Tank 1 Level",
    (SELECT ([Tank_ID]) FROM Tanks WHERE Tanks.fk_IBX_ID = IBXs.IBX_ID AND Tanks.Main_Tank_Index = 2) AS "Main Tank 2 ID",
    AST_UST_Level2 AS "Latest Main Tank 2 Level",
    (SELECT ([Tank_ID]) FROM Tanks WHERE Tanks.fk_IBX_ID = IBXs.IBX_ID AND Tanks.Main_Tank_Index = 3) AS "Main Tank 3 ID",
    AST_UST_Level3 AS "Latest Main Tank 3 Level",
    RunData_Date AS "Last Date"
FROM RunData 

INNER JOIN Tanks ON Tanks.fk_GeneratorName_ID = RunData.fk_GeneratorName_ID
INNER JOIN IBXs ON IBXs.IBX_ID = Tanks.fk_IBX_ID
INNER JOIN GeneratorNames ON GeneratorNames.GeneratorName_ID = RunData.fk_GeneratorName_ID

WHERE ([RunData_Date] = (SELECT Max([RunData_Date]) FROM RunData AS T1 WHERE T1.fk_IBX_ID = IBX_ID AND (T1.AST_UST_Level1 > 0 OR T1.AST_UST_Level2 > 0 OR T1.AST_UST_Level3 > 0)))

这实际上是较大数据集的一小部分：

IBX        Generator                                          Main Tank 1 ID Latest Main Tank 1 Level Main Tank 2 ID Latest Main Tank 2 Level Main Tank 3 ID Latest Main Tank 3 Level Last Date
---------- -------------------------------------------------- -------------- ------------------------ -------------- ------------------------ -------------- ------------------------ ----------
DC2        DC2-Generator-1                                    1              16128                    2              16192                    NULL           NULL                     2018-11-08
DC2        DC2-Generator-2                                    1              16128                    2              16192                    NULL           NULL                     2018-11-08
DC2        DC2-Generator-3                                    1              16128                    2              16192                    NULL           NULL                     2018-11-08
DC2        DC2-Generator-4                                    1              16128                    2              16192                    NULL           NULL                     2018-11-08
DC2        DC2-Generator-5                                    1              16128                    2              16192                    NULL           NULL                     2018-11-08
DC2        DC2-Generator-6                                    1              16128                    2              16192                    NULL           NULL                     2018-11-08
DC4        DC4-Generator-A                                    3              25881                    4              26007                    NULL           NULL                     2020-03-18
DC4        DC4-Generator-B                                    3              25881                    4              26007                    NULL           NULL                     2020-03-18
DC4        DC4-Generator-C                                    3              25881                    4              26007                    NULL           NULL                     2020-03-18
DC4        DC4-Generator-D                                    3              25881                    4              26007                    NULL           NULL                     2020-03-18
DC4        DC4-Generator-E                                    3              25881                    4              26007                    NULL           NULL                     2020-03-18
DC4        DC4-Generator-R                                    3              25881                    4              26007                    NULL           NULL                     2020-03-18
DC4        DC4-Generator-S                                    3              25881                    4              26007                    NULL           NULL                     2020-03-18
DC5        DC5-Generator-E                                    12             24079                    13             23774                    NULL           NULL                     2020-03-13
DC5        DC5-Generator-R                                    12             24079                    13             23774                    NULL           NULL                     2020-03-13
DC5        DC5-Generator-S                                    12             24079                    13             23774                    NULL           NULL                     2020-03-13

所以我必须使用DISTINCT，这样我才能将其保存到一个日期。

Power BI-DAX多个查询？

0 个答案: