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 Error in query, Please check it.Unknown column 'author' in 'where clause'
select DISTINCT(p.lit_subcat_id) , c.cat_name,c.cat_url from b_literature_collection p,b_category c, t_issue_content T where c.cat_id=p.lit_subcat_id and p.lit_cat_id=41 and T.lit_id=p.lit_id and T.issue_id='59/74/author-profile' and p.lit_subcat_id not in (select DISTINCT(post_subcat_id) from b_posts px, t_issue_content tx where post_cat_id=41 and px.post_id=tx.article_id and tx.issue_id=59/74/author-profile)