Can I do this with a single query?

Question

I have table A like
Table A
node_id node_no
N1......01
N2......02
N3......03
N4......04
N5......05
Using Table A, I need to populate the Table B having relationship like
Table B
link_id pred_node_id succ_node_id
L1..... N1...........N2
L2..... N2...........N3
L3..... N3...........N4
L4..... N4...........N5
There is a sequencial link between the nodes. We need to arrange the nodes ordered by their node_no so that the sequencial like for nodeds would be 01,02,03,04,05,.... Between each pair of ordered nodes, a link is to be created i.e.
a Link L1 links node N1 (pred_node) and N2 (succ_node),...
Do I have any ways so that I can populate the table B with a single insert...select statement?

Answer 1

SQL> create table tablea
  2  as
  3  select 'N1' node_id, '01' node_no from dual
  4  union all
  5  select 'N2','02' from dual
  6  union all
  7  select 'N3','03' from dual
  8  union all
  9  select 'N4','04' from dual
10  union all
11  select 'N5','05' from dual
12  /
Table created.
SQL> create table tableb(link_id varchar2(10), pred_node_id varchar2(10),succ_node_id varchar2(10))
  2  /
Table created.
SQL> insert into tableb
  2  select * from
  3  (
  4  select 'L'||to_number(node_no) link_id,node_id,lead(node_id) over(partition by 1 order by to_number(node_no)) succ_node_id
  5  from tablea
  6  )
  7  where succ_node_id is not null
  8  /
4 rows created.
SQL> select * from tableb;
LINK_ID    PRED_NODE_ SUCC_NODE_
L1         N1         N2
L2         N2         N3
L3         N3         N4
L4         N4         N5
SQL>