SQL | Views exercise | Use the designer to create a view, then change its script

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The answer to the exercise will be included and explained if you attend the course listed below!

Software ==> SQL  (198 exercises)
Version ==> Any version of SQL Server
Topic ==> Views  (5 exercises)
Level ==> Average difficulty
Course ==> Introduction to SQL
Before you can do this exercise, you'll need to download and unzip this file (if you have any problems doing this, click here for help). Once you've done this:
  1. Go into SQL Server Management Studio;
  2. Open the SQL file you've just unzipped (you can press CTRL + O to do this); then
  3. 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:

Designing a 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:

View executed

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:

Scripting 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:

Final results

This SQL should return just 4 rows.

 

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

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