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Databases SQL Basics Finding the Data You Want Review & Practice with SQL Playgrounds

Posted by Elaine Tran
Elaine Tran
809 Points

Is there a better way to solve "Find all the invalid ratings in one query." I did NOT IN (1,2,3,4,5).

-- Review ratings should be only be 1-5. Find all the invalid ratings in one query

SELECT * FROM reviews WHERE rating NOT IN (1, 2, 3,4,5);

It worked, but I'm wondering if there's a better way. Thanks in advance.

4 Answers

Joel Bardsley
Joel Bardsley
31,249 Points
Joel Bardsley
Joel Bardsley
31,249 Points

You could use the BETWEEN operator, which would make the query:

SELECT * FROM reviews WHERE rating NOT BETWEEN 1 AND 5;
Elaine Tran
Elaine Tran
809 Points

Thank you Joel! :)

Diana Ci
Diana Ci
18,672 Points
Diana Ci
Diana Ci
18,672 Points

SELECT * FROM reviews WHERE rating < 1 OR rating > 5;

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Treehouse Project Reviewer
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Treehouse Project Reviewer 
SELECT * FROM reviews WHERE rating NOT BETWEEN 1 AND 5 OR rating IS NULL;
Mohammed Safiulla D
Mohammed Safiulla D
17,927 Points
Mohammed Safiulla D
Mohammed Safiulla D
17,927 Points

I guess it's always better to be explicit when coding however I tried for columns where information was NULL (for example the year_released in movies table; there are no reviews with null ratings). I found that NOT BETWEEN removes NULL values by default. The following 2 lines give the same result :

select * from movies where year_released  not between 2000 and 2005;
select * from movies where year_released  not between 2000 and 2005 or year_released is null;

Still, I would do what you did and always be explicit while coding :)

Codeon Tech
Codeon Tech
1,150 Points
Codeon Tech
Codeon Tech
1,150 Points

SELECT * FROM reviews WHERE rating IN (5);