# Exercise: Use CALCULATE to show the value of sales for watery habitats

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

 Category ==> Power BI - Excel 2016  (24 exercises) Topic ==> The CALCULATE function  (3 exercises) Level ==> Average difficulty Course ==> PowerPivot / Excel Power BI
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). Once you've done this:
1. Go into SQL Server Management Studio;
2. Open the SQL file you've just unzipped (you can press CTRL + O to do this); then
3. Execute this script.

This will generate the database that you'll need to use in order to do this exercise (note that the database and script are only to be used for exercises published on this website, and may not be reused or distributed in any form without the prior written permission of Wise Owl).

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The aim of this exercise is to show the percentage of the values of sales for each region attributable to watery habitats.  Read on!

First import the following tables into a PowerPivot data model in a new workbook:

The tables that you'll need to import for this exercise.

In the Purchase table, create a measure to calculate the total value of sales for habitats with id numbers 3 and 4 (corresponding to fresh and salt water respectively).

You'll need to use the CALCULATE function, the SUMX function to sum (price * quantity) and the double pipe characters ( || ) to denote "or".

Use this measure to show total watery sales by shopping centre type:

You should format your numbers to look nice!

Now create another (similar) measure called Vegetation, showing the total value of sales for vegetative habitats (id numbers 1 and 2, for grasslands and forest respectively).

Use this to create and show a third measure called Water-to-veg ratio, to get this pivot table:

Factory outlets have the smallest ratio (surely a fact worth shouting about).

Save your workbook as What about the desert, then close it down.

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