SQL | Aggregation and grouping exercise | Show the number of events, and the earliest/latest date

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 ==> Aggregation and grouping  (8 exercises)
Level ==> Relatively easy
Classroom ==> Introduction to SQL  /  Fast-track SQL
Online ==> Introduction to SQL  /  Fast-track 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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Create a query to list out the following statistics from the table of events:

Statistics report

You'll need to use the COUNT, MAX and MIN functions respectively.

 

Your query won't need a GROUP BY, as you're not grouping by anything - just a SELECT and a FROM.

Save this query as Statto, 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.
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FloridaMan   Reply to FloridaManReply
23 Sep 21 at 12:40

 

select c.CategoryName as Category_Name

  , count(c.CategoryName) as Number_of_events

  , max(e.EventDate) as Last_Date

  , min(e.EventDate) as First_Date

from [dbo].[tblEvent] e

left join [dbo].[tblCategory] c

on e.CategoryID = c.CategoryID

group by c.CategoryName

order by Number_of_events desc

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