Maybe it help if you choose the level and the full path, like this:

SQL> with student as
  2  ( select 'a' name from dual union all
  3    select 'b' from dual union all
  4    select 'c' from dual union all
  5    select 'd' from dual
  6  )
  7   select name
  8        , level
  9        , sys_connect_by_path(name,' --> ') scbp
 10     from student
 11  connect by prior name > name
 12  /

N      LEVEL SCBP
- ---------- --------------------------------------------------
a          1  --> a
b          1  --> b
a          2  --> b --> a
c          1  --> c
a          2  --> c --> a
b          2  --> c --> b
a          3  --> c --> b --> a
d          1  --> d
a          2  --> d --> a
b          2  --> d --> b
a          3  --> d --> b --> a
c          2  --> d --> c
a          3  --> d --> c --> a
b          3  --> d --> c --> b
a          4  --> d --> c --> b --> a

15 rows selected.

Now, it shows that you generate 4 trees. One for each record, because there is no clause "begins by" specified. And then the tree is constructed using the clause "previous name > name", hence this exit.

I hope this helps.

Kind regards
Rob.

Tags: Database

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