*hi*
*
*
*i have a reporting query which have 2 long sub-query*
SELECT r1.code_centre, r1.libelle_centre, r1.id_equipe, r1.equipe,
r1.id_file_attente,
r1.libelle_file_attente,r1.id_date, r1.tranche,
r1.id_granularite_de_periode,r1.granularite,
r1.ContactsTraites, r1.ContactsenParcage,
On Wed, Jun 2, 2010 at 10:28 AM, Lin Chun franks1...@gmail.com wrote:
*don't know it very clear, but i think is the problem of derived seems it
take full scaning*
Yes, it has no indexes so it isn't good for very large subqueries.
You should create them as temporary tables instead and give them
