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Software ==>	SQL (129 exercises)
Topic ==>	Subqueries (5 exercises)
Level ==>	Harder than average
Subject ==>	SQL training

Use two subqueries to list all events in neither the last 30 countries or the last 15 categories

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 subquery to list out all of those events whose:

Country id is not in the list of the last 30 country ids in alphabetical order; and
Category id is not in the list of the last 15 category ids in alphabetical order.

You'll need to use the words NOT IN, as well as TOP N ... DESC.

Your query should list these 8 events (shown here in chronological order):

These events occurred in countries and categories coming early in the alphabet.

Save this query as Early events, 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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From:	YUVA
When:	31 Jul 23 at 19:12

Reply to YUVA

Select
E.eventname,
e.eventdetails
from tblEvent e inner join tblCountry c on e.CountryID=c.CountryID
where c.CountryID not in (select top 30 c.CountryID from tblCountry c order by c.CountryName desc) and
CategoryID not in (select top 15 k.CategoryID from tblCategory as k order by k.CategoryName desc)

From:	FelixP
When:	21 Mar 21 at 10:51

Reply to FelixP

MYSQL solution

For mysql-typical error 1235 see this https://stackoverflow.com/questions/17892762/mysql-this-version-of-mysql-doesnt-yet-support-limit-in-all-any-some-subqu

SELECT EventName , EventDetails
   FROM tblEvent e1
WHERE e1.CountryID NOT IN
( SELECT sub1.CountryID FROM -- wrapping due due Error code: 1235
(SELECT c1.CountryID FROM tblCountry c1
   ORDER BY c1.CountryName DESC
   LIMIT 30) sub1
)
AND e1.CategoryID NOT IN
(
       SELECT sub2.CategoryID FROM -- wrapping due due Error code: 1235
(SELECT cat1.CategoryID FROM tblCategory cat1
       ORDER BY cat1.CategoryName DESC
       LIMIT 15) sub2
)
ORDER BY e1.EventDate

From:	bhilarev
When:	26 Oct 17 at 10:23

Reply to bhilarev

Select EventName,EventDetails,CountryID
From EventInfo
Where CountryId NOT IN
(
Select Top 30 CountryID
From Country
Order By CountryName Desc
)
And CategoryID NOT IN
(
Select Top 15 CategoryID
From Category
Order By CategoryName Desc
)

From:	Zerish
When:	23 May 18 at 04:34

Reply to Zerish

SELECT EventName,EventDetails
FROM tblCountry
INNER JOIN tblEvent
ON tblCountry.CountryID=tblEvent.CountryID
INNER JOIN tblCategory
ON tblCategory.CategoryID=tblEvent.CategoryID
WHERE tblCountry.CountryID NOT IN
(SELECT TOP 30 tblCountry.CountryID
FROM tblCountry
ORDER BY CountryName DESC)
AND
tblCategory.CategoryID NOT IN
(SELECT TOP 15 tblCategory.CategoryID
FROM tblCategory
ORDER BY tblCategory.CategoryName DESC)
ORDER BY EventName DESC

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EXERCISE TOPIC

SQL EXERCISES

SQL EXERCISES

Use two subqueries to list all events in neither the last 30 countries or the last 15 categories

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