DAX Measure to calculate aggregate data, but group by Case ID

问题

So I have a variable

var varSubItem = CALCULATE (MAX(Outages[SubItem]), Outages[DATE] >= DATE(2019, 07, 14) )

to calculate out items that have had an outage within 1 day. See below.

Then I have another variable

var data =
CALCULATE (
    COUNT ( Outages[CASE_ID] ),
    ALLSELECTED ( Outages ),
    Outages[SubItem] = devices
)

which gives me back the outage count for the devices in the last 2 years. It's only the last two years because my table visual has a filter for that time frame.

I pray that I'm making sense because I have been trying to do this for 2 weeks now.

Devices w Outages 2Yr =
VAR devices =
    CALCULATE ( MAX ( Outages[DEVICE_ID] ), Outages[DATE] >= DATE ( 2019, 07, 14 ) )
VAR data =
    CALCULATE (
        COUNT ( Outages[CASE_ID] ),
        ALLSELECTED ( Outages ),
        Outages[DEVICE_ID] = devices
    )
RETURN data

I'm getting this,

| Area   | Item | SubItem | Case      | Date            | Outage Count |
|--------|------|---------|-----------|-----------------|--------------|
| XXXXX' | ABC1 | 123A    | 123456789 | 7/14/19 1:15 AM | 1            |
|        | ABC2 | 123B    | 132456798 | 7/14/19 3:20 AM | 1            |
|        | ABC3 | 123C    | 984561325 | 7/14/19 6:09 PM | 1            |
|        | ABC4 | 123D    | 789613453 | 7/14/19 3:54 PM | 3            |
|        | ABC5 | 123E    | 335978456 | 7/14/19 2:10 PM | 2            |
| Total  |      |         |           |                 | 8            |

When I should be getting this,

| Area   | Item | SubItem | Case      | Date            | Outage Count |
|--------|------|---------|-----------|-----------------|--------------|
| XXXXX' | ABC1 | 123A    | 123456789 | 7/14/19 1:15 AM | 1            |
|        | ABC2 | 123B    | 132456798 | 7/14/19 3:20 AM | 1            |
|        | ABC3 | 123C    | 984561325 | 7/14/19 6:09 PM | 1            |
|        | ABC4 | 123D    | 789613453 | 7/14/19 3:54 PM | 1            |
|        | ABC4 | 123D    | 789613211 | 4/19/18 4:20 AM | 1            |
|        | ABC4 | 123D    | 789611121 | 9/24/17 5:51 AM | 1            |
|        | ABC5 | 123E    | 335978456 | 7/14/19 2:10 PM | 1            |
|        | ABC5 | 123E    | 335978111 | 2/21/19 7:19 AM | 1            |
| Total  |      |         |           |                 | 8            |

回答1:

I think what you want is closer to this:

Devices w Outages 2Yr =
VAR devices =
    CALCULATETABLE (
        VALUES ( Outages[SubItem] ),
        ALLSELECTED ( Outages ),
        Outages[DATE] >= TODAY() - 1
    )
RETURN
    CALCULATE (
        COUNT ( Outages[Case] ),
        FILTER ( Outages, Outages[SubItem] IN devices )
    )

This creates a list of SubItem values rather than the single one you get with MAX and that's where your ALLSELECTED function needs to go.

Edit: To total at the SubItem level try this tweak:

Devices w Outages 2Yr =
VAR devices =
    CALCULATETABLE (
        VALUES ( Outages[SubItem] ),
        ALLSELECTED ( Outages ),
        Outages[DATE] >= TODAY() - 1,
        VALUES ( Outages[SubItem] )
    )
RETURN
    CALCULATE (
        COUNT ( Outages[Case] ),
        ALLSELECTED ( Outages ),
        Outages[SubItem] IN devices
    )

The exact logic here is a bit complex for a beginner DAX user, but just keep in mind that DAX is all about filters.

For the variable devices, we want a list of all SubItem values in the current context subject to a date constraint. The CALCULATETABLE function allows us to modify our filter context. The ALLSELECTED function is a table filter removes any filter context from the visual so that all Date and Case values that aren't filtered out by slicers or page/report level filters are included. Otherwise, you'd get blanks for rows that have dates before TODAY()-1. The date value boolean filtering is self-explanatory, but then I add another table filter at the end, VALUES(Outages[SubItem]), to add back the SubItem context from the visual.

The CALCULATE piece functions similarly. We count all the Case values after altering the filter context to remove filter context on Case and Date and only taking SubItem values from the list generated in the variable.

来源：https://stackoverflow.com/questions/57044216/dax-measure-to-calculate-aggregate-data-but-group-by-case-id

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