Forum Discussion
The expression refers to multiple columns. Multiple columns cannot be converted to a scalar value.
Hi all,
I have a fact table with these columns:
- Ticket ID (INCIDENT_NUMBER)
- effective start date (DATA_INIZIO_COMPETENZA)
- effective end date (DATA_FINE_COMPETENZA)
I'd like to build a chart that count (distinct) ticket ID valid at the calendar date (last 30 days).
Using CALCULATE, DISTINCT COUNT received the error in the Subject
Expression:
2 Replies
- Greg_Deckler
Community Champion
Right, so you are comparing a column from one table to an entire table so that's not going to work. You would need to compare to a single filtered value in that column. Perhaps we should back up, what are you trying to accomplish?
Please see this post regarding How to Get Your Question Answered Quickly: https://community.powerbi.com/t5/Community-Blog/How-to-Get-Your-Question-Answered-Quickly/ba-p/38490
The most important parts are:
1. Sample data as text, use the table tool in the editing bar
2. Expected output from sample data
3. Explanation in words of how to get from 1. to 2.Thank you. I'm trying to create a chart that shows the history of valid tickets (the progress of this count over time).
On the x-axis, I have the calendar; on y-axis I have the count of valid tickets on that date.
I was able to calculate the value on the single date (below expression is running), but I can't handle the observation date as a variable.
BacklogToday = CALCULATE(DISTINCTCOUNT(HPD_HELP_DESK_HIS_T[INCIDENT_NUMBER]);ISBLANK(HPD_HELP_DESK_HIS_T[DATA_FINE_COMPETENZA]) || HPD_HELP_DESK_HIS_T[DATA_FINE_COMPETENZA] > TODAY();HPD_HELP_DESK_HIS_T[DATA_INIZIO_COMPETENZA]<=TODAY())
How can I make the date a variable (time)? And so look how the volume changes over time?Thanks again!
