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SQL | Subqueries exercise | List events not in 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.
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- 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).
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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.
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
Where CountryId NOT IN
Select Top 30 CountryID
Order By CountryName Desc
And CategoryID NOT IN
Select Top 15 CategoryID
Order By CategoryName Desc
INNER JOIN tblEvent
INNER JOIN tblCategory
WHERE tblCountry.CountryID NOT IN
(SELECT TOP 30 tblCountry.CountryID
ORDER BY CountryName DESC)
tblCategory.CategoryID NOT IN
(SELECT TOP 15 tblCategory.CategoryID
ORDER BY tblCategory.CategoryName DESC)
ORDER BY EventName DESC