use [msdb]

declare @job_name varchar(100)

set @job_name = N'jobname'

--注：job_name为维护计划对应的job name

--删除在计划里面的日志

delete sysmaintplan_log from  sysmaintplan_subplans as subplans

 inner  join sysjobs_view as syjobs on subplans.job_id = syjobs.job_id 

 inner  join sysmaintplan_log on  subplans.subplan_id =sysmaintplan_log.subplan_id

where (syjobs.name = @job_name)

--删除代理的作业

delete  sysjobschedules from  sysjobs_view v  

inner join  sysjobschedules o on  v.job_id=o.job_id  where  v.name=@job_name

--删除子计划

delete  sysmaintplan_subplans from  sysmaintplan_subplans  as subplans 

inner join sysjobs_view as  syjobs  on subplans.job_id = syjobs.job_id 

where  (syjobs.name = @job_name)

--删除作业

delete from  msdb.dbo.sysjobs_view where name = @job_name