Exercise: Use calculated columns to aggregate building data in new ways

This exercise is provided to allow potential course delegates to choose the correct Wise Owl Microsoft training course, and may not be reproduced in whole or in part in any format without the prior written consent of Wise Owl.

The answer to the exercise will be included and explained if you attend the Wise Owl course listed below!

Category ==> Power BI Desktop  (26 exercises)
Topic ==> Calculated columns  (2 exercises)
Level ==> Average difficulty
Course ==> Power BI Desktop
Before you can do this exercise, you'll need to download and unzip this file (if you have any problems doing this, click here for help).

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Create a new Power BI Desktop file, and load both worksheets from the Excel workbook in the above folder (you can view the original Skyscraper Centre data via a link here).

You'll probably need to click on the Use first row as headers tool in Query Editor for each worksheet.

Create a relationship to show for each building which country it is in:

Relationships diagram

Link the country codes together.

Create a table showing the number of buildings for each country name, and you should get this:

Number of buildings by country

If you include the Country from the Countries table, you'll get this, but there's a blank country at the top of the table.

 

The problem is that our countries table isn't complete.  To get round this, create a new column in the Buildings table which gives:

  • the country name, if it can find a related value in the Countries table; or
  • Other otherwise.

You'll need to use the IF and RELATED functions.

Replace the country column in your table with this new column to get the final answer:

Table of correct data

The Other country appears halfway down the list, and has 4 countries.

 

Save this file as Russia and Vietnam, and close down the instance of Power BI Desktop containing it.

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