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Software ==>	SSAS - tabular (30 exercises)
Topic ==>	Date calculations (3 exercises)
Level ==>	Average difficulty
Subject ==>	SSAS training

Use various DAX calendar-based functions to return interesting statistics!

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.

Before you can do this exercise, you'll need to download and unzip this file . Once you've done this:

Go into SQL Server Management Studio;
Open the SQL file you've just unzipped (you can press CTRL + O to do this); then
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).

If you haven't already done so, create a new project called BaseModel, and import the following tables: Centre, CentreType, Environment, Family, Habitat, Product, Purchase, Region and Town.

Import the wo_Calendar table (rename it as Calendar) and create a relationship via the purchase date column:

Link the calendar and purchase tables together by the purchase date.

See how many of the following measures you can create (this pivot table is just showing data for 2020 and 2021):

See the next page for hints!

Here are the measures that you need to create:

Measure	Hints/notes
Total qty	The total quantity sold for the current query context.
Last year total	Use the PARALLELPERIOD function to calculate the total quantity sold for the whole of the previous year.
PercentLastYear	Divide the [Total qty] measure by the [Last year total] one, using DIVIDE to return BLANK if there's a problem (otherwise figures for early years will return a divide-by-zero error).
YearToDate	Use the TOTALYTD function to calculate year-to-date sales.
LastYearYTD	Use a combination of the SAMEPERIODLASTYEAR and DATESYTD functions to calculate the year-to-date figures for the equivalent period in the previous year.