WISE OWL EXERCISES
SSAS - TABULAR EXERCISES
- Creating a data model (2)
- Excel pivot tables (1)
- PowerView (2)
- Power BI Desktop overview (1)
- Other data sources (1)
- Calculated columns (4)
- Measures (3)
- Changing query context (2)
- The EARLIER Function (1)
- DAX queries (3)
- Date calculations (3)
- Hierarchies (1)
- KPIs (2)
- Perspectives (1)
- Prototyping using PowerPivot (1)
- Security (2)
SSAS - tabular | Calculated columns exercise | Using COUNTROWS and RELATEDTABLE in calculated columns
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- 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).
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Create a new project called Counting, importing the tables tblRegion, tblTown and tblCentre. 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.