I have a fully qualified date table to which I have added a column that contains a decimal number representing the year fraction. The Excel formula takes an existing "DayOfYear" column and divides by 365. After calculating the results in this manner, I then copied the column and pasted the results as "Values," so in my spreadsheet I have a perfectly normal column of decimal numbers.
When I import this column into the existing date table in Power BI, however, this new column is populated with "null" instead of the data that appear in the spreadsheet.
Any help would be appreciated.
I switched the data type around and tried everything including text. Nada. I finally deleted the column in the Excel spreadsheet and added a calculated column to the spreadsheet in the PBI Query Editor, which is working.
I had a similar problem but in my case I was importing 12 files with the same structure and on one of them there was a column that only cointaned null values on power query.
This was because power query is REALLY case sensitive.
So I had:
11 files with column name = "EXample" (one of them was my "sample file" on "combine&edit")
1 file with column name = "Example"
as the names are not exact matches (upper case vs lower case) power query doesn't extract the values
I just had to check that excel file and change the column name to the right one.
I hope it still helps someone!
Regarding this specific problem, I didn't have any null problems importing.
I still followed this post answers: https://community.powerbi.com/t5/Desktop/Yearfrac-in-Query-editor-does-not-work/td-p/453998