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Software ==>	SSAS - tabular (30 exercises)
Topic ==>	Calculated columns (4 exercises)
Level ==>	Average difficulty
Subject ==>	SSAS training

Count the number of rows in a related table, using the RELATEDTABLE function

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).

Create a new project called Counting, importing the tables Region, Town and Centre. Create a calculated column in the region table to show how many rows there are in the centre table for each region:

The calculated column gives the same answer for every row.

The reason the answer is the same for every region is that no account is being taken of the relationship between the tables. To solve this, use the RELATEDTABLE function to get:

The RELATEDTABLE function returns the number of centres for each region which match up.

Create another calculated column giving the number of towns for each region:

The South-East has the most towns, it seems.

That's it!

You can find other training resources for the subject of this exercise here:

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EXERCISE TOPIC

SSAS EXERCISES

SSAS - TABULAR EXERCISES

Count the number of rows in a related table, using the RELATEDTABLE function

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