Select ... Not IN et autres bizarreries

Vite fait qui ne marche pas (0 résultat (???), 4 secondes) :

SELECT *
FROM   lux_ResourcesEntrys
WHERE  idResourcesEntry NOT IN (SELECT idEntry FROM lux_Extends)

Vite fait qui se traine (2874 résultats, 13 secondes) :

SELECT *
FROM   lux_ResourcesEntrys
MINUS
SELECT *
FROM   lux_ResourcesEntrys
WHERE  idResourcesEntry IN (SELECT idEntry FROM lux_Extends)

Bien fait (2874 résultats, 101 milli-secondes) :

SELECT T1.*
FROM   lux_ResourcesEntrys T1, lux_Extends T2
WHERE  T1.idResourcesEntry = T2.idEntry(+)
AND    T2.idEntry IS NULL
ORDER BY T1.idResourcesEntry DESC