Sébastien LELONG ha scritto: >> As you can see the from_obj of subselect is wrong, the FROM should be: >> >> FROM azienda_veterinario, unita_aziendale >> > > OK, I see... You probably mean that since your sub-select occurs on two > tables, those have to be present in the FROM clause. I've tested this kind on > query (select a from A where a in (select b from B where a = b)) and this > works ok (MySQL). Your sub-query becomes invalid if taken alone, but the > whole keeps correct. What's the error when performing manually the query > (using mysql client or the like) ? > > Seb > I know it works but the problem is the performance.
this query takes 0m31.073s: SELECT unita_aziendale.id FROM unita_aziendale WHERE unita_aziendale.id IN (SELECT azienda_veterinario.id_unita_aziendale AS id_unita_aziendale FROM azienda_veterinario WHERE azienda_veterinario.id_veterinario = 3 AND azienda_veterinario.id_unita_aziendale = unita_aziendale.id AND azienda_veterinario.data_inizio IS NOT NULL AND azienda_veterinario.data_fine IS NULL) this one takes 0m0.686s SELECT unita_aziendale.id FROM unita_aziendale WHERE unita_aziendale.id IN (SELECT azienda_veterinario.id_unita_aziendale AS id_unita_aziendale FROM azienda_veterinario, unita_aziendale WHERE azienda_veterinario.id_veterinario = 3 AND azienda_veterinario.id_unita_aziendale = unita_aziendale.id AND azienda_veterinario.data_inizio IS NOT NULL AND azienda_veterinario.data_fine IS NULL) jo --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To post to this group, send email to sqlalchemy@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~----------~----~----~----~------~----~------~--~---
