Forum Discussion
URGENT! Add rows with missing dates in Power Query
Hi, Syndicate_Admin
Please try follow steps:
1. group all rows by column ’DeclarationDate‘
2. Inset a step after step 'Grouped Rows' as below to get the list of missing date
= Table.RenameColumns(Table.FromList(List.Difference(List.Dates(List.Min(#"Grouped Rows"[DeclarationDate]),Duration.TotalDays(List.Max(#"Grouped Rows"[DeclarationDate])-List.Min(#"Grouped Rows"[DeclarationDate])), #duration(1,0,0,0) ), #"Grouped Rows"[DeclarationDate]), Splitter.SplitByNothing(),null, null, ExtraValues.Error), {{"Column1", "DeclarationDate"}})3.Concatenate rows from the tables generated in the previous two steps
= Table.Combine({#"Grouped Rows", ListMissingDates})4.sort the new table
5.fill down the column value
6. expand the column you need
result：
Please check my sample for more details.
Similar thread:
How to fill in missing data values in timeseries by linear interpolation
Best Regards,
Community Support Team _ Eason
If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.
Basically, you need to table,
1. your fact table
2. Calendar Table: pls refer to this video: https://youtu.be/CIfwwD5986Y
steps:
1. Merge calendar & fact table --> expand and take only the columns you need from the fact table
(for merge & append refer this video: https://youtu.be/5UGxSFzw5W4)
2. you will get the blank for those rows for which you don't have data.
3. under transform --> fill --> fill down
Hope this will help.
Thanks & Regards,
Mohammed Adnan
Learn Power BI: https://www.youtube.com/c/taik18
Thanks & Regards,
Mohammed Adnan
Thank you very much Mohammed
Something I must not have done correctly, as I have this result.
1- Create my table of all the dates of the year
2- Group my data table by Model, but when Merge with date table, the missing dates are added correctly, but not for each model. That is, what I should do is for example, add for the days of 1/4 to 4/4, 3 times for each model. with null quantity.. and when you make FillDown take the value of the corresponding model from the last date, in this case, 31/3
Hi, Syndicate_Admin
Please try follow steps:
1. group all rows by column ’DeclarationDate‘
2. Inset a step after step 'Grouped Rows' as below to get the list of missing date
= Table.RenameColumns(Table.FromList(List.Difference(List.Dates(List.Min(#"Grouped Rows"[DeclarationDate]),Duration.TotalDays(List.Max(#"Grouped Rows"[DeclarationDate])-List.Min(#"Grouped Rows"[DeclarationDate])), #duration(1,0,0,0) ), #"Grouped Rows"[DeclarationDate]), Splitter.SplitByNothing(),null, null, ExtraValues.Error), {{"Column1", "DeclarationDate"}})3.Concatenate rows from the tables generated in the previous two steps
= Table.Combine({#"Grouped Rows", ListMissingDates})4.sort the new table
5.fill down the column value
6. expand the column you need
result：
Please check my sample for more details.
Similar thread:
How to fill in missing data values in timeseries by linear interpolation
Best Regards,
Community Support Team _ Eason
If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.Hi v-easonf-msft,
while this is an amazing logic, seems like there's a prerequisite that you have all plants available for each date. Unless I'm mistaken, this is how the grouping works.
Say for example we have plant A and plant B available on May 1st 2023, it groups them. Then, on May 2nd 2023, we have plant B only. This way, May 2nd 2023 will not be identified as a missing date for plant A, therefore will not list out.Also, what if we need to reference multiple columns, not only plants?
Appreciate any help on the way around it, thanks much!
Hi Syndicate_Admin.
In my reply, I want you to merge Calendar & Fact, but you did Merge Fact & Calendar
In my answer Calendar is the base table.
Try to merge the fact table using the Calendar table and pick a column from the fact table by keeping the calendar as a base, because it has to give continuous dates.
Thanks & Regards,
Mohammed Adnan
Learn Power BI: https://www.youtube.com/c/taik18
