i wanted to get user names who are created only 20 documents using DQL query?

Please any one can tell me that how can i get user names who are created only 20 documents using DQL query.

thanks in advance.

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select count(*),u.user_name from dm_user u, dm_document d where u.user_name=d.r_creator_name group by u.user_name having count(*) = 20