What is wrong with my wp query? Trying to exclude category 14

query('showposts='.$display_count.'&orderby=comment_co开发者_运维知识库unt&category__not_in=14');

I do a standard query and it still wont leave out posts that are in category 14.

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query('showposts='.$display_count.'&orderby=comment_count&cat=-14');