Left join that includes some values and excludes other values

I have an article database that associates articles with tags through the table "articles_tags" (this table has two columns: article_id and tag_id). Articles can have multiple tags. I would like to be able to select articles that have certain tags but also do not have others.

I have the part that only includes articles with certain tags working. In this example the query selects all articles that have been tagged with both tag id 10 and tag id 11:
Code: SELECT `articles`.`id` FROM `articles` LEFT JOIN `articles_tags` ON `articles_tags`.`article_id` = `articles`.`id` WHERE `articles_tags`.`tag_id` IN(10,11) GROUP BY `articles`.`id` HAVING COUNT(tag_id) = 2

How can I modify this to still include articles with both tag ids 10 and 11 but that also do not have tags ids 12 or 13 So for example:
article 1 (has tags 9, 10) - excluded
article 2 (has tags 9,10,11) - included
article 3 (has tags 9,10,11,12) - excluded
article 4 (has tags 9,10,11,13) - excluded

Posted On: Wednesday 24th of October 2012 01:25:43 AM Total Views:  237
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