Groupby - Summation

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Posted on by Migrated_User

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I find this Groupby feature very useful for data manipulation.

When I use Gallery to show "CitiesByCountry" (from Groupby collection) and wish to list out: By Country and Total Population (of all the cities of this country), I am stuck!

- Country can be shown easily with ThisItem.Country; What about the formula for the Summation of Population (of all the cities of the particular country?)

PK Hong

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Building Power Apps

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Migrated_User 2,129 on at

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To get the sum of the population you'll need to use the following expression

Sum(<expression that gets the grouped table for the specific country>, Population)

For example, if you have a gallery like the one below, with the Items property set to CitiesByCountry:

The first text box (larger font) has its Text property set to ThisItem.Country. The second textbox (displaying the total population has the Text property set to Sum(ThisItem.Cities, Population).

Carlos Figueira

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Migrated_User 2,129 on at

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Thanks...MAGIC! MAGIC!

I wrote the same formula Sum(ThisItem.Cities, Population) but it appeared to be error. WHY?

But when I re-do as you said, OK!

I guess, sometimes, as of my experience, I need to either RETYPE, or Quit the program and re-Load.

Strange, Strange, Strange!

BUT, anyway, thanks a lot.

NB: In fact, I am grouping more than that, e.g.:ClearCollect(FarmHouse, Groupby(TableFarm, "FarmName", "HouseNo", "HouseQty), so that I can have double FILTERING of FarmName - then - HouseNo, to get the Sum of HouseQty.

This is a very useful features for multi-layer data manipulation.

Thanks.

PK Hong

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Brian1 2 on at

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Hi.. if you have a data source going to a collection - the collection is called SumSalesbyProduct, with three columns Product, Date, and Sales. How do I sum the sales per Product to get the overall sales per Product. Thanks.

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Community Power Pla... Microsoft Employee on at

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I do not know how to use the Collection for get a partial sum,
but if you want to show the sum of a GroupBy function in a Gallery, you can use the AddColumns function to create a new field with the sum that can be used to show the sum of underlying data in the Gallery.

The Gallery definition could for example be:
Items = AddColumns(GroupBy(DATASOURCE, "FIELDTOGROUPBY","NAMEOFGROUP"),"SUMCOLUMN", Sum(NAMEOFGROUP, FIELDTOSUM))

Then you can add a label in the gallery with:
Text = Thisitem.SUMCOLUMN

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