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select substr(max(sys_connect_by_path(tname, ',')), 2)
from (
  select b.tname, b.t1, lead(b.t1, 1) over (order by b.t1) t2
  from (
       select a.tname, row_number() over (order by tname desc) t1 from tab a
  ) b
)
start with t2 is null
connect by prior t1 = t2;


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