---（方法1）ID 不重复
delete from jobs where job_id not in
( select min(job_id) as job_id from jobs group by job_desc )
---（方法2）如果ID 也重复
select distinct * into #tmp from jobs --将不重复的数据插入临时表#tmp
drop table jobs -- 删除 原表 jobs
select * into jobs from #tmp --将临时表#tmp 数据 放回 原表 jobs
drop table #tmp --删除临时表#tmp
