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select a.task_id,a.title,a.grade,a.school,
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from
(select b.id as task_id,b.title as title,b.grade as grade,b.school as school ,sum(case when task_state=3  then 1 else 0 end)as count1 from ec_role_task c
join ec_role
a on a.id=c.role_id and del_state=0  and LAST_VISIT_TIME >=
convert(varchar(19),dateadd(month,-3,getdate()),21)

join ec_task
b on b.id=c.task_id and accept_again=0
group by b.title,b.grade,b.id,b.school
)a,
(select count(id) as  count2 ,school from ec_role where del_state =0 and LAST_VISIT_TIME >=
    convert(varchar(10),dateadd(month,-3,getdate()),21) and grade >= 25 and grade < 30 group by school  )c ,ec_task t
    where t.id=a.task_id and (case a.school =3 then a.school=c.school else a.school<>c.school end )
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