SQLite

select * from message where 
       flag=0 
       or 
       (
          (dealno=6 or (removeno in 
                    (select removeno from message where removedate >= ‘2017-12-25 09:00:00‘
                    ))
          ) 
       and 
       (
           (senddate >= ‘2017-12-25 09:00:00‘  
           or dealdate >= ‘2017-12-25 09:00:00‘ 
           or removedate >= ‘2017-12-25 09:00:00‘
           )
       and senddate <=‘2017-12-25 24:00:00‘
       )
       )
order by senddate

select * from message where flag=0 or ((dealno=#{dealno} or (removeno in (select removeno from message where removedate >= #{removedate}))) 
        and ((senddate >= #{senddate}  or dealdate >= #{dealdate} or removedate >= #{removedate}) 
        and senddate <=#{senddate2}))
        order by senddate