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SQL | Views exercise | Use the designer to create a view, then change its script
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.
You can learn how to do this exercise if you attend one of more of the courses listed below!
| Software ==> | SQL (198 exercises) |
| Version ==> | Any version of SQL Server |
| Topic ==> | Views (5 exercises) |
| Level ==> | Average difficulty |
| Classroom ==> | Introduction to SQL / Fast-track SQL |
| Online ==> | Introduction to SQL / Fast-track SQL |
- 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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Use the view designer to create this new view:
Count the number of events by category (to add grouping in a view, right-click in the tables area at the top of view view and choose Add Group By).
When you execute your view, it should show something like this:
Your view should list the number of events for each category.
Save this view as EventsByCategory (you'll need to accept the change suggested about adding a TOP 100 PERCENT clause).
Now choose to change the script of your view:
Choose to alter your view in a new query window.
Tidy your SQL up, and also change the view so that it returns the results in ascending rather than descending order. Your final SQL might look something like this:
ALTER VIEW EventsByCategory AS
-- show number of events by category
SELECT TOP 100 PERCENT
c.CategoryName AS Category,
COUNT(e.EventName) AS What
FROM
tblCategory AS c
INNER JOIN tblEvent AS e
ON c.CategoryID = e.CategoryID
GROUP BY
c.CategoryName
ORDER BY
-- change the sort order
What ASC
Type in and run a separate query looking something like this, to show the results of this view:
SELECT
*
FROM
EventsByCategory
WHERE
-- more than 50 events
What > 50
Here are the results this should show:
This SQL should return just 4 rows.
Save your script as A nice view, then close it down.