學習必須先入門帅容，站在山頂，學習第一手資料去俯瞰全貌，拒絕二手或者n手資料蓝纲，浪費時間而且還不一定對阴孟。
jenkins roadmap:
ant top
selinum top
jmeter top
select 0 as rown,* from basebook where book_id = 566
union
SELECT (SELECT COUNT(*) FROM basebook AS t2 WHERE t2.book_id < t1.book_id)+1 AS rown, *
FROM basebook t1
where book_id != 566
order by rown asc
