using doubt connect by front
HelloI use ORACLE 10.2.0.3.0
I have the table with columns foll
2 routes R1 and R2
R1: N1-N2-N8
R2-N1-N7-N2-N8
WITH t1 AS (SELECT 'R1' route_id,'N1' from_node,'N2' to_node,'S444554' schedule_id FROM dual UNION ALL
SELECT 'R1','N2','N8','S444555' FROM dual UNION ALL
SELECT 'R2','N1','N7','S444556' FROM dual UNION ALL
SELECT 'R2','N7','N2','' FROM dual UNION ALL
SELECT 'R2','N2','N8','S444555' FROM dual) SELECT route_id,from_node,to_node,schedule_id,LEVEL lvl FROM t1
CONNECT BY from_node = PRIOR to_node
START WITH from_node NOT IN (SELECT to_node FROM t1)
ROUTE_ID FROM_NODE TO_NODE SCHEDULE_ID LVL
R1 N1 N2 S444554 1
R1 N2 N8 S444555 2
R1 N2 N8 S444555 3---------not required
R2 N1 N7 S444556 1
R2 N2 N8 S444555 2---------not reuired
R2 N7 N2 2
R2 N2 N8 S444555 3
now i don't need the records (which are marked with not required) coming from present query
i need the output something like
ROUTE_ID FROM_NODE TO_NODE SCHEDULE_ID LVL
R1 N1 N2 S444554 1
R1 N2 N8 S444555 2
R2 N1 N7 S444556 1
R2 N7 N2 2
R2 N2 N8 S444555 3
can any body help meThank you
Don't forget the route_id:
SQL> with t as
2 (select 'R1' route_id, 'N1' from_node, 'N2' to_node, 'S444554' schedule_id from dual union all
3 select 'R1', 'N2', 'N8', 'S444555' from dual union all
4 select 'R2', 'N1', 'N7', 'S444556' from dual union all
5 select 'R2', 'N7', 'N2', '' from dual union all
6 select 'R2', 'N2', 'N8', 'S444555' from dual
7 )
8 --
9 select route_id, from_node, to_node, schedule_id, level lvl
10 from t
11 start with from_node not in (select to_node from t)
12 connect by from_node = prior to_node
13 and route_id = prior route_id;
RO FR TO SCHEDUL LVL
-- -- -- ------- ----------
R1 N1 N2 S444554 1
R1 N2 N8 S444555 2
R2 N1 N7 S444556 1
R2 N7 N2 2
R2 N2 N8 S444555 3
5 rows selected.
And thanks for the display of the sample data! :)
Tags: Database
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