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select loan_plan_id,l_collect_plan.loan_id,l_collect_detail.collect_isfinished from l_collect_plan
left join l_collect_detail on l_collect_plan.return_times=l_collect_detail.collect_volume and l_collect_plan.loan_id=l_collect_detail.loan_id
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loan_plan_id      loan_id    collect_isfinished 
  1           1       1                          ----1
  3           1       1                          ----2
  4           1       NULL                        ----3
  5            2       NULL                        ----4
  6           2       NULL                        ----5
  7           2       0                          ----6
  7           2       1 


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