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.

Software ==> SQL  (198 exercises)
Version ==> Any version of SQL Server
Topic ==> Subqueries  (5 exercises)
Level ==> Harder than average
Subject ==> SQL training
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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):

8 events returned

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.
This page has 2 threads Add post
FelixP   Reply to FelixPReply
21 Mar 21 at 10:51

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

bhilarev   Reply to bhilarevReply
26 Oct 17 at 10:23

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
)

Zerish   Reply to ZerishReply
23 May 18 at 04:34

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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