Power BI Report SUM - Snack 12

Welcome back!  It is time to talk maths for a moment.  There is a bit here that is kind of important to know.

If you are using the same fields I am, you will notice something a little unusual at the top of the Table visual that we put together.  Many of the columns begin with "Sum of ...," instead of simply stating the column name.

What does that mean?

It means that it is summarizing that column. It is not the same as adding, but it is.  It is not the same function as Excel, but it is.

I know, that is not exactly helpful.

Well, it is not exactly easy to explain either.

Hopefully, this example will help.

If I have multiple Sales entries on a certain date, it will only show the total of those entries on that date for all of the attributes chosen.

Still confused?

If we only had the one attribute "Sale Amount?" it would summarize that.  Consider these entries.

    6/1/2014 - $3
    6/1/2014 - $2
    6/1/2014 - $6
    7/1/2014 - $4

Using this data, our table would likely appear as follows:

    6/1/2014 - $11
    7/1/2014 - $4

Of course, if you added another attribute to that, such as Country, it would appear differently.  Consider these entries.

    6/1/2014 - $4 - Canada
    6/1/2014 - $1 - France
    6/1/2014 - $5 - France
    7/1/2014 - $2 - Canada

Using this data, our table would likely appear as follows:

    6/1/2014 - $4 - Canada
    6/1/2014 - $6 - France
    7/1/2014 - $2 - Canada

What if I do not want to summarize that data?  What if you want an Average, Median, Standard Deviation, Variance, or some other standard statistical representation?

Get back into your report and ...

1. Choose "Edit" mode
2. Select the Visualization
3. In the Visualization Pane,
1. Click the tiny down arrow next to "Sum of Sales"
1. A somewhat lengthy menu appears, with a checkmark next to "Sum."
2. Choose "Don't Summarize" and watch the results change.
3. Go back and choose any of the other options below that.
4. Try them all if you like.
1. Keep in mind what was just explained.
4. DO NOT SAVE!

Basically, this is how we define the appearance of our data in the visualization.

Most of the time, we are going to want it to "Sum."

There are times, and types of data, that you do not want to "Sum" or cannot "Sum" without some other calculation.

If you choose any of the columns that host text values, you will notice that they do not offer the option to "Sum."  Those only offer First, Last, Count, or Count (Distinct) and that is but one example.  There are others.

Think about how you would use this with your data, and we will come back to it another time.