Dear readers my reference in this post from Pete Finnigan book How to unwrap PL/SQL How to ...

Oracle10g connect_by_isleaf The pseudo-column, connect_by_isleaf, returns 1 if the current row is a leaf (child and it is not father)...

The purpose of the connect_by_iscycle pseudo-column is to return 1 if the current row has a child which is also its ancestor. If there is ...

connect_by_root connect_by_root is only valid in hierarchical queries. When a column is qualified with this operator, Oracle return...

you can use SELECT * FROM V$VERSION or SELECT version FROM V$INSTANCE or BEGIN  DBMS_OUTPUT.PUT_LINE(DBMS_DB_VERSION.VERSION || ...

Hierarchical Queries If a table contains hierarchical data, then you can select rows in a hierarchical order using the hierarchical ...

-- Hierarchical Tree Example -- The first action will typically be to populate the -- hierarchical tree (htree) with data. DEC...