sql中查找下一记录的语句

SELECT t_a.job_id, t_a.max_lvl, ISNULL(max_lvl - ISNULL
((SELECT max_lvl
FROM jobs
WHERE job_id =
(SELECT MAX(job_id)
FROM jobs
WHERE job_id < t_a.job_id)), 0), 0) AS 差额
FROM jobs t_a

pubs数据库jobs表,job_id为int型