mysql - order by sql query error -

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$post_items = $db->query("select post_id,content,date,category_id          post_items join user on(post_items.user_id = user.user_id) post_items.user_id =" . $userid)

how can include order in case? tried

$post_items = $db->query("select post_id,content,date,category_id          post_items join user on(post_items.user_id = user.user_id) post_items.user_id =" . $userid ."order post_id");

please, apply space between field , order keyword, , use tablename if columnaname ambiguse in query use join :

$post_items = $db->query("select post_id,content,date,category_id          post_items inner join user on post_items.user_id = user.user_id            post_items.user_id =" . $userid ." order post_items.post_id ");

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