DAX-Power BI bring unique values from a column - powerbi

I'm currently trying to create a new column and bring the unique values from column 3( the ones that are not on column 1 or column 2). Could you help to create a DAX formula to pull this info?
The data that i want to reach is at column 4
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Related

Power BI calculate dates in between 2 or more dates in a single column

The first table is dummy data I created which explains about my database, Second bottom table is the result I want to see
Firstly, the most important point is that the DATE&TIME column is set as a date field. Only Date, not Date/Time.
You can create new column for Date variable or replace existing DATE&TIME column.
Secondly, you must to create a new measure for Status count.
Finally, I use to Matrix visualization.

Am trying to create a matrix to compare CY and PY

I am creating a matrix in powerbi to compare current and previous years by month, also to show the % variance, which is the CY-PY/CY.
this is what am getting
what i want to achieve is this
As very limited information is provided:
If the year(2020 and 2021) are columns for each month's values. It would be better to first declare Variance% as a custom column in the edit query(under 'add column' and give the formula of variance).
Select Column 2020,2021 and Variance% ->Right click->Unpivot selected column, this would define all these columns as attributes and store values as Value.
Save and close changes made in the edit query and in the page select Matrix graph and build the graph.

Power BI: Append similar table but null in custom column

I have a table in Power BI which I'm working with. In this table I have some regular columns with values and I've created a custom column with a very simple formula. In this example the custom column is the result of A + B.
Column A Column B Custom Column
0 20 5 25
1 30 10 40
2 10 20 30
My problem is when in the Power Query Editor I try to append a new table with the same structure of columns of the main one but it appears null in the values of the custom column. This new table contains as well Column A and Column B but in the Custom it doesn't appear the result A + B but it appears 'Null'.
Is there any way of solve this? I mean, when I add a new table automatically it shows the values in custom columns instead of 'Null'. Thanks in advance.
If I get your issue correct, you are performing the "Add Custom Column" steps before you are appending both table. You can just change steps sequence between "Add Custom Column" and "Append Table".
First perform the "Append Table" step and then add the step "Add Custom Column". This will solve your issue.
Here is your case-
Here is after altering the steps-

Show All Column Values

Is it possible to show a column in a matrix table when there is no row in the dataset. E.g in Excel you can create a manual table as below and when data exists it populates according. So if the dataset has no row for 100 Days + this should show as 0. But in Power BI the columns only show if there is data. So the tables are all different sizes. 
What i want to show is the below but i am only getting 3 columns in power bi (0-1 days, 2-7 days and 8-14 days) and not the whole groups 
Any help is appreciated! 
Yasir

Sorting the Column Series by date order in Line and Stacked Column chart in Power BI

I have created a Line and stacked column chart for each week.
Since the values are grouped by date in the week, the values are not shown in a proper order of date.
How can I sort it, so that, it is displayed in the increasing order of date?
Attached screenshot with an explanation. How can I sort the column series with respect to date?
You can create a new calculated column of int values (for instance:1901,1801,1701 etc) and sort the column you want by that calculated column from the Sort by Column option in the Modeling tab.