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This page has 2 threads | Add post

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Exercises

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Software ==>	SQL (202 exercises)
Topic ==>	Aggregation and grouping (12 exercises)
Level ==>	Relatively easy
Subject ==>	SQL training

Use GROUP BY and COUNT to report on the number of events for each category

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.

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).

Create a query which:

groups by the category name from the category table; and
counts the number of events for each.

You'll need to create a join between the tblCategory and tblEvent tables to do this.

Here's what you should see if you sort your query to show the categories with most events first:

First few events

The first few categories returned by your query. Politics trumps everything.

Save this query as Politics and disaster, 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:

This page has 2 threads

From:	Bhavya59
When:	01 Aug 24 at 11:32

SELECT c.CategoryName AS Categories

,COUNT(c.CategoryID) AS TotalEvents

FROM tblCategory c LEFT JOIN tblEvent e

ON c.CategoryID=e.CategoryID

GROUP BY c.CategoryName

ORDER BY TotalEvents DESC

Reply

From:	FloridaMan
When:	23 Sep 21 at 12:34

select c.CategoryName as Category_Name

, count(c.CategoryName) as Number_of_events

from [dbo].[tblEvent] e

left join [dbo].[tblCategory] c

on e.CategoryID = c.CategoryID

group by c.CategoryName

order by Number_of_events desc

***BOOM,DONE***

From:	FadwaEgypt
When:	23 Oct 21 at 19:35

EXCELLENT

Reply

Reply

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