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Software ==>	SQL (202 exercises)
Topic ==>	Views (7 exercises)
Level ==>	Average difficulty
Subject ==>	SQL training

Create a view in the view designer, tidy up its SQL and use it to select data

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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).

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.

Note that the ORDER BY clause in the view may not affect the results correctly. Alter the view once more to remove the ORDER BY clause, then add an ORDER BY clause to the query which selects from the view.

Save your script as A nice view, then close it down.

You can unzip this file to see the answers to this exercise, although please remember this is for your personal use only.

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

You can also book hourly online consultancy for your time zone with one of our 7 expert trainers!

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From:	Orin
When:	11 Dec 25 at 09:39

I was running round in circles about the ORDER BY clause.

But (as the ultimate picture of the exercise confirms) the ORDER BY inside the view does not work (anymore). The answer to this post gives some explanation.

Hence, the end of the exercise should be:

SELECT *

FROM EventsByCategory

WHERE What > 50

ORDER BY What

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EXERCISE TOPIC

SQL EXERCISES

SQL EXERCISES

Create a view in the view designer, tidy up its SQL and use it to select data

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