Discussion :

[Brets]

Bonjour � tous,

Je suis en train d'utiliser la fonctionnalit� d'oracle sur la r�cursivit�.
Ca marche tr�s bien lorsque j'utilise ceci :

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select SYS_CONNECT_BY_PATH(ih.child_id, ' - '), level
from INV_HIERARCHIES ih
start with ih.parent_id = 5011528
connect by prior ih.child_id = ih.parent_id

En revanche lorsque je veux utiliser une jointure avec une autre table comment faire?
Ceci ne marche pas :

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select SYS_CONNECT_BY_PATH(ih.child_id, ' - '), level, ii.NAME
from INV_INVESTMENTS ii,
     INV_HIERARCHIES ih
start with ih.parent_id = 5011528
connect by prior ih.child_id = ih.parent_id
where ii.id = ih.child_id

Quelqu'un peut-il m'aider sur la bonne syntaxe?

Merci beaucoup.
Eric.

[Waldar]

En positionnant bien le WHERE :

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select SYS_CONNECT_BY_PATH(ih.child_id, ' - '), level, ii.NAME
from INV_INVESTMENTS ii,
INV_HIERARCHIES ih
where ii.id = ih.child_id
start with ih.parent_id = 5011528
connect by prior ih.child_id = ih.parent_id

Ou mieux :

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    select sys_connect_by_path(ih.child_id, ' - '), level, ii.name
      from inv_investments ii
           inner join inv_hierarchies ih
             on ih.child_id = ii.id
START with ih.parent_id = 5011528
CONNECT by PRIOR ih.child_id = ih.parent_id

Notez bien aussi les remarques suivantes tir�es de la documentation officielle :

Oracle processes hierarchical queries as follows:
* A join, if present, is evaluated first, whether the join is specified in the FROM clause or with WHERE clause predicates.
* The CONNECT BY condition is evaluated.
* Any remaining WHERE clause predicates are evaluated.

[boutade80]

Oracle processes hierarchical queries as follows:
* A join, if present, is evaluated first, whether the join is specified in the FROM clause or with WHERE clause predicates.
* The CONNECT BY condition is evaluated.
* Any remaining WHERE clause predicates are evaluated.

Ca devrait eviter la jointure a faire avant la recherche recursive.

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WITH INV_HIERARCHIES AS
(
SELECT 1 AS id,null AS child_id FROM dual union ALL
SELECT 2 , 1 FROM dual union ALL
SELECT 3 , 1 FROM dual union ALL
SELECT 4 , 2 FROM dual
),
INV_INVESTMENTS AS
(
SELECT 1 AS id,'Durand' AS name FROM dual union ALL
SELECT 2 ,'Dufour' FROM dual union ALL
SELECT 3 ,'Cheng' FROM dual union ALL
SELECT 4 ,'Moise' FROM dual
)
select hier,lv,name
from
(
SELECT SYS_CONNECT_BY_PATH(ih.child_id, ' - ') as hier, level as lv, ih.id
FROM INV_HIERARCHIES ih
start WITH ih.id = 1
connect BY prior ih.id = ih.child_id
) req JOIN INV_INVESTMENTS ii ON ii.id = req.id

[mnitu]

Ca devrait eviter la jointure a faire avant la recherche recursive.
...

Oui mais, �a ne donne pas forcement le m�me r�sultat.