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Software ==>	SQL (129 exercises)
Topic ==>	Subqueries (5 exercises)
Level ==>	Relatively easy
Subject ==>	SQL training

Use a subquery to show events which happened since the last one for a particular country occurred

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 lists out all of the events in the tblEvent table which happened after the last one for country 21 (International) took place. Here's the gist of what you need to do:

--SELECT

--list of fields

--FROM

--table of events

--WHERE

--Event date > (

--SELECT MAX(Event date)

--FROM table of events

--WHERE country id = 21

--)

-- ORDER BY

--Event date (descending)

You should get these 4 events:

There are only 4 events which happened after the last international one.

Save this query as Post-Int Notes, 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:

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EXERCISE TOPIC

SQL EXERCISES

SQL EXERCISES

Use a subquery to show events which happened since the last one for a particular country occurred

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