Single value error when creating a measure

[sdavis]

Hi, 

I am new to PowerBI and  am creating a measure for calculating uptime %. I tried to create the measure, but got an error because one column wasn't aggregated. The error stated, "A single value for column Total Units in table Location_Table cannot be determined."

How can I calculate the uptime % for every Location? Location is the unique column in the Location_Table. Here's the tables:

Fault_Table
UnitKey	Location
1001	CA
1002	CA
1003	CA
1005	CA
1007	OK
1010	TN

Location_Table
Location	Total Units
CA	2000
OK	1000
TN	3000

For Faulted Units, I am counting the keys: COUNT(Fault_Table[UnitKey]).

Here's the formulas:
Working Units = Total Units – Faulted Units
Uptime % = Working Units/Total Units

Please let me know if I can provide more information. 

[danextian]

Hi @sdavis,

Measures need to be aggregated.  It should be something like this:

MEASURE =
DIVIDE ( SUM ( 'Table'[Column1] ), SUM ( 'Table'[Column2] ) )

[v-yuezhe-msft · Accepted solution]

@sdavis,

Please check the dax formula in the PBIX file below.

https://1drv.ms/u/s!AhsotbnGu1NokzYo2PT_Khg-2MG0

Regards,
Lydia

[sdavis]

Thank you, that worked!