select * from article
 INNER JOIN (
 SELECT id
 FROM article
 WHERE
  length(content_url) > 0 and
  (select status from source where id = article.source_id)=1 and
  (select status from category where id = article.category_id)=1 and
  status = 1 and id < 2164931
 order by stick desc,pub_time desc
 limit 240,15
 ) AS t
USING(id);

 select * from article
 INNER JOIN (
 SELECT id FROM article WHERE INSTR(ifnull(title,''),'战狼') > 0 and status != 9
 order by pub_time desc
 limit 100,10

 ) AS t USING(id);

INSTR(ifnull(title,''),'战狼') > 0，为啥不用like......

desc or explain看看，filesort.....给pub_time加个index看看，还是filesort.....

select * from article where status != 9 order by pub_time desc limit 100000,25;
desc or explain，还是filesort.....前面不是给status和pub_time建了联合索引了吗，tell me why......

SELECT * from follow
 where (((SELECT status FROM source WHERE id=follow.source_id)=1 and follow.type=1) or ((select status from topic WHERE id=follow.source_id)=1 and follow.type=2)) AND user_id=10054
 ORDER BY sort limit 15,15;
 SELECT * from follow inner join(
 SELECT id from follow
 where (((SELECT status FROM source WHERE id=follow.source_id)=1 and follow.type=1) or ((select status from topic WHERE id=follow.source_id)=1 and follow.type=2)) AND user_id=10054
 ORDER BY sort limit 15,15
 ) as t using(id);
 (SELECT id, source_id, user_id, temporary, sort, follow_time, read_time,type from follow where (SELECT status FROM source WHERE id=follow.source_id)=1 and follow.type=1 and user_id=10054)
 union all
 (SELECT id, source_id, user_id, temporary, sort, follow_time, read_time,type from follow where (select status from topic WHERE id=follow.source_id)=1 and follow.type=2 and user_id=10054)
 ORDER BY sort limit 15,15;