POWER BI EXERCISES▼
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Power BI | Calculated columns exercise | Use calculated columns to aggregate building data in new ways
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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:
Link the country codes together.
Create a table showing the number of buildings for each country name, and you should get this:
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:
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.