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Software ==>	SQL (203 exercises)
Topic ==>	Variables (11 exercises)
Level ==>	Relatively easy
Subject ==>	SQL training

Using variables create a summary output window of aggregated data.

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).

The aim of this exercise is to summarise events using the MIN, MAX and COUNT functions:

The snag? You're not allowed to use GROUP BY!

To do this, create variables to hold each of the aggregates:

Variable	What it will hold eventually
@EarliestDate	The earliest date
@LatestDate	The latest date
@NumberOfEvents	The number of events
@EventInfo	The title Summary of events

Now use a single SELECT clause to set the value for all of these variables (alternatively you could use a series of subqueries).

Write another SELECT clause to show the value of the variables, to show the summary output shown above.

Optionally save this as The early, the late and the rest.sql and 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:

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From:	Devender
When:	23 Jan 24 at 13:42

use WorldEvents

declare @EarliestDate date =

( select min(eventdate) from tblEvent)

declare @latestdate date = (

select max(eventdate) from tblEvent)

declare @NumberOfEvents int = (

select COUNT(*) from tblEvent e)

declare @EventInfo varchar(50)= 'Summary of events'

select

@EventInfo as 'tilte',

@EarliestDate as 'Earliset Date',

@LatestDate as 'Latest Date',

@NumberOfEvents as 'Number of Events'

From:	Drago
When:	09 May 23 at 21:25

declare @EventInfo varchar(25)= 'Summary of events'

declare @EarliestDate date =
(
   select
   MIN(e.EventDate)
   from tblEvent e
)

declare @LatesttDate date =
(
   select
   Max(e.EventDate)
   from tblEvent e
)

declare @NumberOfEvents int =
(
   select
   COUNT(*)
   from tblEvent e
)

Select
   @EventInfo as Title,
   @EarliestDate as 'Earliset Date',
   @LatesttDate as 'Latest Date',
   @NumberOfEvents as 'Number of Events'

From:	akanksha1989
When:	23 Nov 18 at 13:33

Hello.

I'm having trouble getting this exercise done.

Is there anywhere i can get the solution?

From:	shivendra
When:	16 Dec 18 at 07:26

use WorldEvents
declare @EarliestDate datetime
declare @latestDate datetime
declare @NoOfEvents int
declare @Eventimfo varchar(max)='Summary of event'

select @EarliestDate=min( cast(EventDate as date)) from dbo.tblEvent
select @latestDate=max(cast(EventDate as date)) from dbo.tblEvent
select @NoOfEvents=count(EventID) from dbo.tblEvent

select @Eventimfo as Title, @EarliestDate as EarliestDate,@latestDate as latestDate,@NoOfEvents as NoOfEvents

From:	Andy B
When:	23 Nov 18 at 15:12

We don't post the answers to exercises (as you'll have noticed) - partly because there has to be some reason to attend our courses, but also because it would remove the incentive to work at finding a solution. For the same reasons we usually don't post prospective answers, but since you ask nicely ... anyone out there able to help and post a solution?

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EXERCISE TOPIC

SQL EXERCISES

SQL EXERCISES

Using variables create a summary output window of aggregated data.

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