select essays.es_id, essays.es_title,essays.Cat_ID,essays.es_title as title,essays.es_pic AS picture, essays.es_summary AS summary, essays.es_date AS date, essays.es_reads From essays,category where category.Cat_ID=essays.Cat_ID
and category.Cat_ID ='21' AND essays.es_status=1 order by essays.es_order asc,essays.es_id desc