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Software ==>	SQL (203 exercises)
Topic ==>	Calculations (18 exercises)
Level ==>	Harder than average
Subject ==>	SQL training

Divide events according to whether their first/last letters are the same or vowels

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).

If you've reached this point, you're probably ready for a challenge. See if you can write a query to list out all of the non-boring events:

The first few of the 28 events you should see.

As the above query shows, a boring event is one which doesn't begin and end with the same letter, and which doesn't begin and end with a vowel!

If you get this working, you could always show that there aren't any ultra-interesting events (ones which begin and end in a vowel).

Save this query as Boring 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:	Bhavya59
When:	31 Jul 24 at 11:57

SELECT [EventName]

,CASE

WHEN EventName LIKE '[AEIOUaeiou]%' AND EventName LIKE '%[AEIOUaeiou]' THEN 'begin and end with a vowel'

WHEN LEFT(EventName, 1) = RIGHT(EventName, 1) THEN 'Same Letter'

ELSE 'Boring events'

END

AS Verdict

FROM [WorldEvents].[dbo].[tblEvent]

From:	Devender
When:	17 Jan 24 at 06:05

select eventname,

case

when left(eventname,1) in ('a','e','i','o','u') and right (eventname , 1) in ('A','E','I','O','U')

THEN 'Begins and with Vowels'

when left(eventname,1) like right(eventname,1) then 'same letter'

end as 'Verdicts'

from tblEvent

where (case

when left(eventname,1) in ('a','e','i','o','u') and right (eventname , 1) in ('A','E','I','O','U')

THEN 'Begins and with Vowels'

when left(eventname,1) like right(eventname,1) then 'same letter'end ) is not null

From:	Yash2211
When:	27 Aug 23 at 17:53

first I created view for simplicty then use logic,

/*Create view table1

select EventName,lower(left(eventname,1)) as lefty,lower(right(eventname,1)) as righty from tblEvent*/

select * from

(select eventname,

Case

when lefty=righty

then 'Same letter'

when righty in ('a','e','i','o','u') and lefty in ('a','e','i','o','u')

then 'Begin and ends with vowel'

end as 'verdict'

from table1) as t

where verdict is not null

From:	Chinmaykumar
When:	01 Jul 23 at 19:53

Query_Sol. for MySQL users

-- Important: in MySQL, '[]' wildcard do not work with LIKE function
-- used left(), right() function to extracts a number of characters from a string

SELECT EventName,
CASE
WHEN LEFT(EventName, 1) IN('A','E','I','O','U') AND RIGHT(EventName, 1) IN('a','e','i','o','u') THEN 'Begins and ends with vowels'
WHEN LEFT(EventName, 1) = RIGHT(EventName, 1) THEN 'Same letter'
END AS Verdict
FROM tblevent
HAVING Verdict IS NOT NULL
ORDER BY EventDate;

From:	zeephremiaa
When:	28 Sep 22 at 02:59

This works as well.

SELECT
   EventName,
   CASE
   WHEN SUBSTRING(EventName, 1,1)=SUBSTRING(EventName, LEN(EventName)-0,LEN(EventName)-0) THEN 'SAME LETTER'
   WHEN SUBSTRING(EventName, 1,1) IN ('A','E','I','O','U') AND SUBSTRING(EventName, LEN(EventName)-0,LEN(EventName)-0) IN ('A','E','I','O','U') THEN 'BEGINS AND END WITH A VOWEL'

   END AS Verdict from tblEvent
   WHERE
   SUBSTRING(EventName, 1,1)=SUBSTRING(EventName, LEN(EventName)-0,LEN(EventName)-0) OR
   (SUBSTRING(EventName, 1,1) IN ('A','E','I','O','U') AND SUBSTRING(EventName, LEN(EventName)-0,LEN(EventName)-0) IN ('A','E','I','O','U'))
ORDER BY EventDate ASC

From:	DbEnthusiast
When:	18 Dec 20 at 16:31

I think the following query should work too!

SELECT EventName
,CASE WHEN EventName LIKE '[AEIOU]%' AND EventName LIKE '%[aeiou]' THEN 'Begin and ends with vowel'
ELSE 'Same Letter' END AS Verdict
FROM tblEvent
Order BY Verdict

From:	SeahawkZim
When:	25 Nov 19 at 02:48

I added in the default of "Boring event" but this can be left out.

From:	SeahawkZim
When:	30 Mar 22 at 00:35

I meant this:

select EventName, case when left(eventname, 1) = right(eventname, 1) then 'Same letter'
when left(eventname, 1) like '[aeiou]' and right(eventname, 1) like '[aeiou]' then 'Begins and ends with a vowel'
else 'Boring event' end as Verdict
from tblevent
WHERE case when left(eventname, 1) = right(eventname, 1) then 'Same letter'
when left(eventname, 1) like '[aeiou]' and right(eventname, 1) like '[aeiou]' then 'Begins and ends with a vowel'
else 'Boring event' end <> 'Boring event'
order by Verdict

From:	Habeshawiw2T
When:	12 Mar 19 at 15:13

SELECT * FROM (
SELECT EventName
       , CASE
           WHEN LOWER(LEFT(EventName,1)) IN ('a','e','i','o','u') AND LOWER(RIGHT(EventName,1)) IN ('a','e','i','o','u')
               THEN 'Begins and ends with vowle'
           WHEN LOWER(LEFT(EventName,1)) = LOWER(RIGHT(EventName,1))
               THEN 'Same letter'
          END AS Verdict
FROM tblEvent ) AS T
WHERE Verdict IS NOT NULL

From:	hjay629
When:	19 Feb 19 at 01:01

NOTE: The QUESTION IS ORDERD BY EVENTDATE, if anyone was wondering the order.

If anyone could verify if this is correct, because it seem uncomfortably long:

SELECT
EventName,
CASE
   WHEN LEFT(EventName, 1) = RIGHT(EventName, 1)
       THEN 'Same letter'
   WHEN (LEFT(EventName, 1) = 'a' OR LEFT(EventName, 1) = 'e' OR LEFT(EventName, 1) = 'i' OR LEFT(EventName, 1) = 'o' OR LEFT(EventName, 1) = 'u') AND (RIGHT(EventName, 1) = 'a' OR RIGHT(EventName, 1) = 'e' OR RIGHT(EventName, 1) = 'i' OR RIGHT(EventName, 1) = 'o' OR RIGHT(EventName, 1) = 'u')
       THEN 'Begins and ends with vowel'

   END as 'Verdict'

FROM
tblEvent
WHERE (CASE
   WHEN LEFT(EventName, 1) = RIGHT(EventName, 1)
       THEN 'Same letter'
   WHEN (LEFT(EventName, 1) = 'a' OR LEFT(EventName, 1) = 'e' OR LEFT(EventName, 1) = 'i' OR LEFT(EventName, 1) = 'o' OR LEFT(EventName, 1) = 'u') AND (RIGHT(EventName, 1) = 'a' OR RIGHT(EventName, 1) = 'e' OR RIGHT(EventName, 1) = 'i' OR RIGHT(EventName, 1) = 'o' OR RIGHT(EventName, 1) = 'u')
       THEN 'Begins and ends with vowel'

   END ) IS NOT NULL

ORDER BY
EventDate

From:	tmccarthygcu
When:	06 Mar 19 at 20:08

Two ways to minimize the code. Firstly use an IN statement to have it group the sections without all those OR statements. To remove the lengthy WHERE clause, simply wrap up the SELECT in parens and name the result, then select all values from the result and do a WHERE on there, as seen here:

USE WorldEvents

SELECT t.* FROM (SELECT EventName,
       CASE WHEN LEFT(EventName, 1) = RIGHT(EventName, 1)
           THEN 'Same Letter'
           WHEN LEFT(EventName, 1) IN ('a', 'e', 'i', 'o', 'u') AND RIGHT(EventName, 1) IN ('a', 'e', 'i', 'o', 'u')
           THEN 'First letter vowel'
       END AS 'Result'
       FROM tblEvent) t
   WHERE t.Result IS NOT NULL

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EXERCISE TOPIC

SQL EXERCISES

SQL EXERCISES

Divide events according to whether their first/last letters are the same or vowels

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