Question

I have this mysql statement:

SELECT  `review_userid` ,  `book_id` ,  `review_id` ,  `user_class` , COUNT( review_id ) 
FROM  `booklist_books` 
LEFT JOIN  `booklist_reviews` ON booklist_books.book_id = booklist_reviews.review_bookid
LEFT JOIN  `e107_user` ON booklist_reviews.review_userid = e107_user.user_id
WHERE '12' NOT IN (`user_class`)
GROUP BY  `review_userid` 
ORDER BY COUNT(`review_id`) DESC 
LIMIT 0 , 100

user_class is a comma-delimited string (e.g: 1,2,3,4,5), as you can see below.

Using phpmyadmin, I get the following result:

Why do I get results that have ’12’ in the user_class field since I am using '12' NOT IN(... ??

If I can’t user user_class in the IN() operator, what is the alternative to this?

Thanks

Answer 1

IN or NOT IN is not working like that, check the function FIND_IN_SET

WHERE FIND_IN_SET('12', `user_class`) = 0