using ' with in select ' to do a recursive query
Hello all dearI have a question about ' with in select ' structure.
Is it possible to do a recursive query with this structure?
for example, this table (River: name, River, Lake, sea), I wrote this query to get all the rivers that flow directly or indirectly into a specific river:
Select the name of the RIVER r
Start with r.river = 'Zaire'
connect prior r.name = r.river
level control
now, how can I write the same function with ' with in select?
IM using oracle 11g.
If you need, I'll provide create/insert to the table.
best, david
Hello
This example gets the same results as searching for CONNECT BY you posted:
WITH tree (name, lvl) AS
(
SELECT name
, 1 AS lvl
FROM river
WHERE river = 'Zaire'
UNION ALL
SELECT r.name
, t.lvl + 1
FROM river r
JOIN tree t ON r.river = t.name
)
SELECT *
FROM tree
ORDER BY lvl, name
;
As you can see, the first part of the clause WITH recursive (the foregoing the UNION ALL) corresponds to the START WITH of a query CONNECT BY clause, and the second (after UNION ALL) corresponds to the CONNECT BY clause.
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) ")
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