ALL SOFTWARE EXERCISES
- EXERCISES HOME PAGE (813)
- Access 2010 (66)
- Access VBA Macros (17)
- Advanced VBA (29)
- Excel 2010 (83)
- Excel 2013 (10)
- Excel 2016 (0)
- Excel VBA Macros (37)
- Power BI - Excel 2013 (25)
- Power BI - Excel 2016 (23)
- Power BI Desktop (26)
- PowerPivot 2010 (26)
- Report Builder 3.0 (42)
- SQL (156)
- SSAS - multidimensional (21)
- SSAS - tabular (29)
- SSIS Integration Services (40)
- SSRS Reporting Services (53)
- Visual Basic (45)
- Visual C Sharp (65)
- WPF - Visual C# (20)
- Simple Queries (4)
- Setting criteria using WHERE (5)
- Calculations (7)
- Calculations using dates (4)
- Basic joins (8)
- More exotic joins (2)
- Aggregation and grouping (8)
- Views (5)
- Subqueries (3)
- Stored procedures (3)
- Variables (4)
- Parameters and return values (4)
- Looping (1)
- Scalar functions (3)
- Transactions (2)
- Creating tables (3)
- Temporary tables and table variables (5)
- Table-valued functions (3)
- Derived tables and CTEs (8)
- Dynamic SQL (2)
- Pivots (2)
- Archived (70)
Exercise: Show the number of events for the top 3 categories/countries
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.
The answer to the exercise will be included and explained if you attend one of more of the courses listed below!
- 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).
You need a minimum screen resolution of about 700 pixels width to see our exercises. This is because they contain diagrams and tables which would not be viewable easily on a mobile phone or small laptop. Please use a larger tablet, notebook or desktop computer, or change your screen resolution settings.
Create two CTEs in the same query as follows:
|CTE||What it should list out|
|TopCountries||The ids of the 3 countries with the most events (use TOP 3)|
|TopCategories||The ids of the 3 categories with the most events (use TOP 3 again)|
Use these to show all possible combinations in a final SELECT statement which should look like this:
-- combine these together (every possible combination)
TopCountries AS cy
CROSS JOIN TopCategories AS cg
The cross join gives all possible combinations of rows in the two CTEs - see overleaf for what the results should look like.
You should now be looking at something like this:
There are 9 possible combinations.
If you still have the energy, use this to show the number of events for each combination:
United Kingdom / Politics is the combination of country and category which has the most events.
Save this as Country category combinations, then close it down.
I have completed the main task but i cannot be able to append the NumberofEvents column - please help me with this.